Stoichiometry Practice

How many particles are in 13.5 grams of Beryllium?

• 1.50 particles

• 9.03 particles

• 4.00x10²³ particles

• 9.03x10²³ particles

Tags

NGSS.HS-PS1-7

When reacting Na with Cl₂, we calculated that the theoretical yield should be 12.5 grams. Our actual yield was 13.0 grams. What is the percent yield?

• 100%
• 104%
• 96%
• 1.04

Tags

NGSS.HS-PS1-7

CH₄ + 2O₂ → CO₂ + 2H₂O

24 grams of CH₄ was added to the above reaction. Calculate the theoretical yield of CO₂.

• 66 grams CO2

• 132 grams CO2

• 33 grams CO2

• 8.72 grams CO2

Tags

NGSS.HS-PS1-7

You need 2 pieces of bread, 1 tablespoon of peanut butter and 2 tablespoons of jelly to make a sandwich.  If you have 10 pieces of bread, 4 tablespoons of peanut butter and 20 tablespoons of jelly, what is the limiting reactant?

• bread
• jelly
• peanut butter
• sandwich

What is the molar mass of Fe₃(PO₄)₂

• 823.8g/mol
• 357.5 g/mol
• 455.6g/mol
• 86.3g/mol

6CO₂ + 6H₂O --> C₆H₁₂O₆ + 6O₂ 
What is the total number of moles of water needed to make 2.5 moles of C₆H₁₂O₆?

• 2.5
• 6
• 12
• 15

Tags

NGSS.HS-PS1-7

What is the mole ratio of H₂O to H₃PO₄ in the following chemical equation?   P₄O₁₀ + 6 H₂O --> 4 H₃PO₄ 

• 6:4
• 4:6
• 1:3
• 3:1

Tags

NGSS.HS-PS1-7

For the reaction represented by the equation Cl₂ + 2KBr → Br₂ + 2KCl, how many grams of potassium chloride (KCl) can be produced from 356 grams potassium bromide (KBr)? Round to one decimal point when calculating.

• 749 g

• 223 g

• 479 g

• 814 g

Tags

NGSS.HS-PS1-7

Given the following percentages: 57.14%C, 6.16%H, 9.52%N, and 27.18% O. Find the empirical formula.

• C20H12N6O9

• C2H11N5O8

• C14H18N2O5

• There is no empirical formula for these elements.

Use the following equation:

2Al + 3Cl2 → 2AlCl3

If 140 grams of aluminum chloride react, how many moles of aluminum will be produced?

• 5.10 moles of Al

• 1.05 moles of Al

• 2.25 moles of Al

• 3.42 moles of Al

Tags

NGSS.HS-PS1-7