Mole Ratio and One-Step Stoichiometry Practice

Use the following equation:
2NaOH(aq) + H₂SO₄(aq) --> 2H₂O(l) + Na₂SO₄(aq)
How many grams of sodium sulfate will be formed if you start with 200 grams of sodium hydroxide?

• 150.22 g Na₂SO₄

• 593.44 g Na₂SO₄

• 330.04 g Na₂SO₄

• 297.65 g Na₂SO₄

Tags

NGSS.HS-PS1-7

151 grams of Al₂O₃ are produced. How many grams of Al was needed in the reaction? Al + O₂ -------> Al₂O₃ balance first.

• 79.91 g

• 22.4 liters

• 57.8 g

• 142.8 g

Tags

NGSS.HS-PS1-7

For the Balanced Reaction: 3 Mg + 1 Fe₂O₃ → 3 MgO + 2 Fe; What is the Ratio of moles of Mg to moles Fe?

• 3mol Mg / 2 mol Fe

• 2 mol Mg/ 3 mol Fe

• 1 mol Fe/ 2 mol Fe

• 3 mol MgO / 2 mol Fe

Tags

NGSS.HS-PS1-7

CO (g) + O₂(g) → 2 CO₂ (g)
In the formation of CO₂ from CO and oxygen, how many Liters of CO₂ are produced by the reaction of 8 mols of O₂ with an excess of carbon monoxide?

• 0.178 L

• 358.4 Liters

• 704 grams

• 0.36 grams

Tags

NGSS.HS-PS1-7

Using the balanced equation in question 5, CaC₂(s) + H₂O(l) --> C₂H₂(g) + Ca(OH)₂(aq)
how many grams of H₂O are needed if 3.20 moles of CaC₂ are consumed?

• 115 g

• 28.8 g

• 0.0889 g

• 6.40 g

Tags

NGSS.HS-PS1-7

What conversion factor do you always use in stoichiometry problems?

• reciprocal of the molar mass of a substance

• molar mass of a substance

• mole ratio

• molar volume of a gas

What is the mole ratio of the hydrogen to oxygen in the Synthesis reaction: hydrogen reacts with oxygen to give you H₂O?

• 1:1

• 1:2

• 2:1

• 2:2

Tags

NGSS.HS-PS1-7

When balancing, what part of a chemical equation are you potentially changing?

• coefficients in front of chemical formulas

• chemical formulas derived from the element boxes

• subscripts within the chemical formulas

• the ions (oxidation states) of polyatomic ions

Tags

NGSS.HS-PS1-7

What is the mole ratio of Aluminum to Oxygen in the chemical reaction: Al + O₂ --> Al₂O₃

• 1:1

• 2:3

• 4:2

• 4:3

• 3: 4

Tags

NGSS.MS-PS1-5

In any stoichiometry problem, what should be common practice in your work shown within your calculation?

• units should cancel from the top of one factor with the bottom of another factor

• there should be a mole ratio as one of the factors

• you need a balanced chemical reaction

• you should write out your chemical formulas for each step

• all the other answers are correct

Tags

NGSS.HS-PS1-7