Answer:
20 moles HCl
Explanation:
To find the final answer, you need to use the mole-to-mole ratio (from the equation) to convert from moles H₂ to moles HCl. Make sure to arrange the ratios in a way that allows for the units of H₂ to cancel out.
1 H₂ (g) + Cl₂ (g) --> 2 HCl (g)
10 moles H₂ 2 moles HCl
------------------- x --------------------- = 20 moles HCl
1 mole H₂
A chemistry graduate student is studying the rate of this reaction:→2Cl2O5g+2Cl2g5O2gShe fills a reaction vessel with Cl2O5 and measures its
Rate = 1.321M/s[H₂CO₃]¹ ; k = 1.32M/s
an imaginary gas phase reaction, according to the equation below is carried out in a closed container. 3.5 moles of A and 3.5 moles of B is introduced in the container. Reaction is carried out at 31.70C and volume of the container is 9.3 L. Percent yield of this reaction is 86.8%. Calculate the pressure of the container after reaction took place. R =0.0821 L.atm/mol.K
A+ 2B → AB2
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(b) Glycogen may be broken down to form glucose.
Fig.2.2 shows region X from the glycogen molecule in Fig. 2.1 in more detail.
Draw an annotated diagram in the space provided to explain how a glucose molecule is
formed from the free end of the glycogen molecule shown in Fig.2.2
Glycogen is formed by the loss of water molecules along the length of the polymer chain as the glucose molecules are joined together.
How is glycogen formed?Glycogen is formed by a process known as condensation polymerization. This involves the loss of -OH from one glucose molecule and the loss of H from another glucose molecule as the chain is formed.
Hence, glycogen is formed by the loss of water molecules along the length of the polymer chain as the glucose molecules are joined together.
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Based on the following reaction, how much water is produced when oxygen react with 1 mole of C₂H8?
C₂H8 (g) + 40₂ (g) →2CO2 (g) + 4H₂O(g)
Answer:
4 moles
Explanation:
For every mole of deuteriomethane consumed, 4 moles of water are produced.
So, the answer is 4 moles.
law and the rate constant for the reaction.
PLEASE HELP!!!!.
A buffer solution was prepared by mixing 150.00 mL of 1.1341 mol/L of CH3COOH
and 100.00 mL of 0.831 mol/L of barium acetate. Determine the pH of the buffer
solution after the addition of 10.00 mL of 0.010 mol sulphuric acid. Kc for acetic acid
is 1.8 x 10-5
The pH of the buffer solution after the addition of sulfuric acid is determined as 4.43.
Initial moles of acid and base
The initial moles of acid and base conjugate is determined as follows;
n = CV
na₁ = (150 x 1.1341)/1000
na₁ = 0.17 mol
nb₁ = (100 x 0.831)/1000
nb₁ = 0.083 mol
Number of moles of the acid addedH₂SO4 ⇄ 2H²⁺ + SO₄²⁻
na₂ = (10 x 0.01)/1000
na₂ = 0.0001 mol
Final number of moles of the acid and basenb = 0.083 - 2(0.0001) = 0.0829 mol
na = 0.17 + 2(0.0001) = 0.1702 mol
pH of the buffer solution[tex]Ka = \frac{[CH_3COO][H^+]}{[CH_3COOH]} \\\\1.8\times 10^{-5} = \frac{0.0829(H^+)}{0.1702} \\\\H^+ = \frac{(1.8 \times 10^{-5})(0.1702)}{0.0829} \\\\H^+ = 3.696 \times 10^{-5}\\\\pH = -Log [H^+]\\\\pH = -Log (3.696 \times 10^{-5})\\\\pH = 4.43[/tex]
Thus, the pH of the buffer solution after the addition of sulfuric acid is determined as 4.43.
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To what temperature must a balloon, initially at 9°C and 4.00 L, be heated in order to have a volume of 6.00 L?
The balloon must be heated to a temperature of 150 °C in order to have a volume of 6.00 L.
How are volume and temperature of gases related?The volume of a gas is directly proportional to the temperature of the gas.
According to Charles' law: V1/T1 / = V2/T2
V1 =4.0 L
T1 = 9°C = (273. + 9) K = 282 K
V2 = 6.0 L
T2 = ?
T2 = V2×T1/V1
T2 = 6 × 282 / 4 = 423 K
423.2 K = 423 -273 = 150 °C
Therefore, the balloon must be heated to a temperature of 150 °C in order to have a volume of 6.00 L.
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What is the balanced form of the chemical equation shown below? C12H22O11(I) + O2(g) -> H2O(I)
[tex]C_{12}H_{22}O_{11} + 12O_2[/tex] → [tex]12CO_2 + 11H_2O[/tex] is the balanced form of the chemical equation.
What is the balanced equation?A balanced equation is an equation for a chemical reaction in which the number of atoms for each element in the reaction and the total charge are the same for both the reactants and the products.
12 hydrogen, 35 oxygen, and 22 hydrogens are present on both sides of the reaction.
[tex]C_{12}H_{22}O_{11} + 12O_2[/tex] → [tex]12CO_2 + 11H_2O[/tex]
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considering the temperature vs. time graph below, how does the temperature at the beginning of a change of state
ompare with the temperature at the end of the change?
O The temperature is always lower.
O The temperature is always the same.
O The temperature is usually lower.
The temperature is usually higher.
Answer:
temp is same
Explanation:
The change of state portionsof the graph are at 2 and 4....and the temp is the same at the beginning and ends.
change of state is a constant temp process
Which statement best describes the role of oxygen in cellular respiration?
OA. Oxygen molecules are a waste product of electron flow.
B. Oxygen molecules form as ATP molecules are made.
OC. Oxygen molecules form as sugar molecules are broken down.
OD. Oxygen molecules are used to make water molecules.
The role of oxygen in cellular respiration is to make water molecules. hence, option (D) is correct.
What is Cellular respiration ?
Cellular respiration is the process in which cells break down molecules for energy.
The cells use oxygen to break down food in the form of glucose to produce water and release carbon dioxide.
During aerobic cellular respiration, glucose reacts with oxygen, forming ATP that can be used by the cell. Carbon dioxide and water are created as byproducts.
In this reaction, energy is produced in the form of ATP that is used by the cell for its various activities.
Thus the correct answer is option D.
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A piece of copper has a mass of 290 g. How many atoms does the sample contain?
A piece of copper that has a mass of 290 g has 2.748 *10²⁴ molecules.
What is a mole ?A mole is a unit of measurement which relates the molar mass to the amount of the number of atoms and molecules .
1 mole = 6.022 *10²³ molecules or atoms
Molecular weight of copper = 63.55
290 g of Copper = 290/63.55 = 4.56 moles
1 mole has 6.022 *10²³ molecules or atoms
4.56 mole has 4.56 *6.022*10²³ molecules or atoms
= 2.748 *10²⁴ molecules.
A piece of copper that has a mass of 290 g has 2.748 *10²⁴ molecules.
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describe another way in which human activities that benefit society can also cause environmental risk.
Which of the following best defines balanced forces?
A. Forces that act in opposite directions and cancel each other out
B. Unequal forces that do not cancel out and that cause a change in
motion
OC. The total force on an object after individual forces are added
together
D. Forces between two objects in physical contact
Answer:
Balanced forces are forces that act in opposite directions and cancel each other out
let me know if you have any other questions
Answer:
Discuss about Library Automation Life cycleExplanation:
How much volume (in cm^3)is gained by a person who gains 11.8 lb of our fat? Human fat has a density of 0.918 g/cm^3
The volume (in cm³) gained by a person who gains 11.8 lb of fat is 5830.49 cm³
What is density?The density of a substance is simply defined as the mass of the subtance per unit volume of the substance. Mathematically, it can be expressed as
Density = mass / volume
How to convert pounds to grams1 lb = 453.592 g
Therefore,
11.8 lb = 11.8 × 453.592
11.8 lb = 5352.3856 g
How to determine the volume Mass = 5352.3856 gDensity = 0.918 g/cm³Volume =?Volume = mass / density
Volume = 5352.3856 / 0.918
Volume = 5830.49 cm³
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Predict the products and write the balanced Equation for the following:
“Aqueous Copper (II)Chloride reacts with aqueous Tin (IV) Nitrite."
Answer:
2 CuCl₂ (aq) + Sn(NO₂)₄ (aq) ---> 2 Cu(NO₂)₂ (aq) + SnCl₄ (aq)
Explanation:
You can safely assume that this is a double-displacement reaction. In these reactions, the cation of one molecule is substituted for the cation of another molecule, and vice versa. Once the reaction occurs, you are left with the products:
copper (II) chloride + tin (IV) nitrite ---> copper (II) nitrite + tin (IV) chloride
The balanced equation is:
2 CuCl₂ (aq) + Sn(NO₂)₄ (aq) ---> 2 Cu(NO₂)₂ (aq) + SnCl₄ (aq)
What is the mass of 15.0 ml of a liquid that has a density of 0.694 g/cm³?
Answer:
10.41 g
Explanation:
ml and cm^3 are generally interchangeable
15 cm^3 * . 694 g/cm^3 = 10.41 g
A piece of unknown solid substance weighs 44.7 grams and requires 2110 J to increase its temperature from 23.2 C to 89.6 C. What is the specific heat of the substance?
Answer:
silicon 0.712 J/g°C
Explanation:
i hope this helps you, sorry if im wrong, but this should be correct!
Answer:
.7109 j / gm-C
Explanation:
Specific heat = j/gm-C
j = 2110 gm = 44.7 C = ( 89.6-23.2) = 66.4
2110 /(44.7 * 66.4) = .7109 j/gm-C
Which of the following is the conjugate base of H3PO4?
2-
OA. HPO4²-
3-
O B. PO4³-
O C. H₂PO4
O D. H₂PO4+
Answer:
H2 PO4 -1 is the correct answer
An acid and a base which differ from each other by a proton are said to form a conjugate pair. Here the conjugate base of H₃PO₄ is H₂PO₄⁻. The correct option is C.
What is a conjugate base?The entity produced when acid gives up a proton has a tendency to regain the proton and hence it behaves as a base. It is called the conjugate base of the parent acid. A base is a substance which acts as a proton acceptor.
Here the conjugate base of H₃PO₄ is formed when a proton is lost from it. So the lose of one proton forms the molecule H₂PO₄⁻ which is the conjugate base. An acid is a proton donor.
When a base accepts a proton it has a tendency to donate the proton and hence behaves as an acid. It is called the conjugate acid of the parent base.
Thus the correct option is C.
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So I’m in 6th grade and this is a chart. I need the # of molecules, # of atoms in each element and the total # of atoms 2H₂SO
Answer:
1.) 2 molecules
2.) 4 H atoms, 2 S atoms, 2 O atoms
3.) 8 total atoms
Explanation:
1.) 2 H₂SO
--------> The molecule is all of the elements bonded together (H₂SO). Because there is a coefficient of 2 in front of the molecule, this means that there are 2 molecules present.
2.) 2 H₂S₁O₁
---------> The number of atoms of each element is determined by the subscripts and the coefficients. In one molecule, there is one oxygen, one sulfur, and 2 hydrogen atoms (denoted by subscripts). Because there are two molecules, these values are doubled.
3.)
--------> The total number of atoms is calculated by adding the number of atoms of each element. If between 2 molecules there are 4 hydrogens, 2 sulfurs, and 2 oxygens, combined there would be a total of 8 atoms.
What is the density of an object if its mass is 10 g and a volume of 2 mL?
Hi there! Let's solve this problem shall we!
⠀Volume = 10g
Mass = 2 mL
In this specific problem, they are asking us to find the density of the object. So, using the information given to us (volume and mass), let's solve the problem!
Now, if you remember, D = M ÷ V
So, let's fill in the blanks!
D = Our unknown value
M = 2mL
V = 10g
Here is the filled out formula:
D = M ÷ V
D = 2mL ÷ 10g
D = 5 g/mL
*Make sure you put the units for your final solution!*
Complete the balanced neutralization equation for the reaction below:
HNO3(aq) + Ba(OH)2(aq) →
The complete equation will look thus: [tex]2HNO_3(aq) + Ba(OH)_2(aq) --- > Ba(NO_3)_2 + 2H_2O[/tex]
Balancing equationsIn order for equations to be balanced, the component atoms in the reactants and products must be the same in terms of number.
Thus, in the given equation, the number of H, N, O, and Ba atoms in the reactants and the products must be equal.
Therefore, the overall equation becomes:
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Answer:2HNO3 + Ba(OH)2 → Ba(NO3)2 + 2H2O
Explanation:
HNO3 + Ba(OH)2 = Ba(NO3)2 + H2O
This is what each element is....
H= 1+2=3 H=2
N=1 N=2
O=2+2=4 O=4+1=5
Ba=1 Ba=1
Now to balance each side.....
H=2+2=4 H=2++2=4
N=2 N=2
O=4+2=6 O=4+2=6
Ba=1 Ba=1
The balanced equation is now
2HNO3 + Ba(OH)2 → Ba(NO3)2 + 2H2O
In a laboratory investigation, a student separates
colored compounds obtained from a mixture of
crushed spinach leaves and water by using paper
chromatography. The colored compounds
separate because of differences in
(1) molecular polarity
malleability
(3) boiling point
(4) electrical conductivity
Answer:
Molecular polarity
Explanation:
tell me if im right
Which of the following is not one of the four things that all organisms need to survive?
A. water
B. air
C. a source of energy
D. the ability to move
Answer:
b
Explanation:
this is because all organisims need water, c is out of the question because no energy is needed, d is out because it is needed for fighting against predators
Potassium fluoride has a solubility of 92 g of KF in 100. g of H₂0 at 18 °C. Determine if
each of the following mixtures forms an unsaturated or saturated solution at 18 C:
a. adding 24 g of KF to 25 g of H₂O
b. adding 47 g of KF to 50. g of H₂O
c. adding 127 g of KF to 150. g of H₂O
a) In 25 grams of water, the solubility is 92/4 = 23 grams, so adding 24 grams will produce a supersaturated solution.
b) In 50 grams of water, the solubility is 92/2 = 46 grams, so adding 47 grams will produce a supersaturated solution.
c) In 150 grams of water, the solubility is 92(1.5) = 138 grams, so adding 127 grams will produce an unsaturated solution.
Which of the following happens during an endothermic chemical change? (5 points)
Group of answer choices
Heat is released.
Net energy decreases.
Products have a higher total potential energy than the reactants.
Products have the same total potential energy as the reactants..
Answer: Products have a higher total potential energy than the reactants.
Explanation:
During endothermic reactions, energy is absorbed, meaning that the products will have more potential energy.
Calculate the solubility of Ca(OH)2 in a 0.469M CaCl2 solution at 31°C, given that the Ksp of Ca(OH)2 is 4.96 x 10-6 at that temperature. Give your answer in milliMolar units 2.927 mM 1.626 mM 2.764 mM 1.382 mM 1.463 mM 3.252 mM
The solubility of Ca(OH)2 in a 0.469M CaCl2 solution at 31°C, at given Ksp of Ca(OH)2 is determined as 1.626 mM.
Dissociation reaction of Ca(OH)2
The dissociation reaction of Ca(OH)2 is given as follows;
Ca(OH)₂ ⇄ Ca²⁺ + 2OH⁻¹
x 2x
Concentration of Ca²⁺ = 0.469 M
Ksp = [x][2x]²
ksp = (0.469)(2x²)
ksp = 4(0.469)x²
ksp = 1.876x²
4.96 x 10⁻⁶ = 1.876x²
x² = (4.96 x 10⁻⁶)/(1.876)
x² = 2.643 x 10⁻⁶
x = √(2.643 x 10⁻⁶)
x = 1.626 x 10⁻³ M
x = 1.626 mM
Thus, the solubility of Ca(OH)2 in a 0.469M CaCl2 solution at 31°C, at given Ksp of Ca(OH)2 is determined as 1.626 mM.
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Light refracts because:
000
it is reflected at a focal point.
it changes speed.
its frequency does not match the object it is striking.
All of the choices are correct.
Unit 1
Refraction is caused due to the change in speed of light when it enters from one medium to another. Hence, option B is correct.
What is refraction?Refraction happens when light changes direction, or bends when it moves from one material to another.
The cause of the refraction of light is that light travels at different speeds in different media.
This change in the speed of light when it moves from one medium to another causes it to bend.
Thus, refraction is caused due to the change in speed of light when it enters from one medium to another. Hence, option B is correct.
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If you dissolve 25.0 g of NaNO3 (Mm = 85.0 g) in 155 mL of water, what is the molarity of the solution? (Report your answer to two places past the decimal point)
Answer:
1.90 M
Explanation:
To find the molarity of the solution, you need to use the molarity equation. This formula looks like this:
Molarity (M) = moles / volume (L)
To use this equation, you need to perform some conversions. You should (1) convert mL to L (by dividing by 1,000), then (2) convert grams NaNO₃ to moles (via molar mass), then (3) plug moles and volume into the molarity equation.
155 mL / 1,000 = 0.155 L
25.0 g NaNO₃ 1 mole
--------------------- x ----------------- = 0.294 moles NaNO₃
85.0 g
Molarity = moles / volume
Molarity = 0.294 moles / 0.155 L
Molarity = 1.8975....
Molarity = 1.90 M
If you dissolve 1.78 g of MgSO4 (Mm = 120.4 g) in 1.10 L of water, what is the molarity of the solution? (Report your answer to four places past the decimal point)
The molarity of the solution given the data from the question is 0.0135 M
What is molarity?
Molarity is simply defined as the mole of solute per unit litre of solution. Mathematically, it can be expressed as:
Molarity = mole / Volume
How to determine the mole of MgSO₄ Mass of MgSO₄ = 1.78 gMolar mass of MgSO₄ = 120.4 g/mol Mole of MgSO₄ =?Mole = mass / molar mass
Mole of MgSO₄ = 1.78 / 120.4
Mole of MgSO₄ = 0.0148 mole
How to determine the molarity Mole of MgSO₄ = 0.0148 mole Volume = 1.1 L Molarity =?Molarity = mole / Volume
Molarity = 0.0148 / 1.1
Molarity = 0.0135 M
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Determine the number of valence electrons for sodium through the use of this table.
Na =
Answer:
Sodium has one valence electron. Valence electrons are electrons found in the outermost shell of an atom. The shell number representing the valence shell will differ depending on the atom in question. For sodium, which is in the 3rd row of the periodic table, the valence electrons will be found in the 3rd shell.
Question 17 of 30
For a reaction, AH = -286 kJ. When is the reaction spontaneous?
A. When TAS> 0
B. When TA S= -286 kJ
C. When TAS<-286 kJ
D. When TAS = 2(-286 kJ)
The reaction is spontaneous when TΔS is greater than zero (TΔS>0).
Spontaneous reactionA spontaneous reaction is determined by applying Gib's free energy formula as follows;
ΔG = ΔH - TΔS
A reaction is spontaneous when Gib's free energy is negative.
For the given example, the change in enthalpy is negative (-286 kJ), to obtain a negative Gib's free energy, the entropy must be positive.
Thus, the reaction is spontaneous when TΔS is greater than zero (TΔS>0).
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