Stoichiometry

 2H₂   +   O₂  →  2H₂O How many moles of water can be produced if 8 moles H₂ are used?

• a. 4 moles

• b. 8 moles

• c. 16 moles

• d. 2 moles

Tags

NGSS.HS-PS1-7

1Mg + 2H₂O --> Mg(OH)₂ + H₂

What volume of hydrogen will be produced at STP by the reaction 67.3 g of magnesium?

• . a. 62.0 L

• b. 0.12 L

• c. 2.77 L

• d. 1.15 L

Tags

NGSS.HS-PS1-7

What is the mole ratio in the following reaction: 2CO + O2 → 2CO2

• a. 2:1:2

• b. 1:1:1

• c. 1:2:1

• d. 2:1:1

Tags

NGSS.HS-PS1-7

KNO₃ --> KNO₂ + O₂ What coefficients are needed to balance the reaction?

• a. 2, 2, 1

• b. 2, 3, 2

• c. 1, 2, 2

• d. 1, 3, 1

Tags

NGSS.HS-PS1-7

The blue numbers in the image below represent ________

• I don't know, and don't want to try

• coefficients

• subscripts

• none of the answers are correct

Tags

NGSS.HS-PS1-7

A number written in front of a chemical formula is called a(n)

• subscript

• superscript

• yield

• coefficient

WO₃ + H₂ --> W + H₂O What coefficient goes in front of H₂?

• a. 1

• b. 2

• c. 3

• d. 4

2 KClO₃ → 2 KCl + 3 O₂ How many moles of oxygen are produced when 6.7 moles of KClO₃ decompose completely?

• a. 6.7 mol

• b. 1.0 mol

• 10.1 mol

• 4.5 mol

Tags

NGSS.HS-PS1-7

. 2Na + 2H₂O → 2NaOH+ H₂ How many grams of hydrogen are produced if 120 g of Na are available?

• a. 5.2 g

• b. 2.6 g

• c. 690 g

• d. 45 g

Tags

NGSS.HS-PS1-7

 2Al + 3H₂SO₄ -> Al₂(SO₄)₃ + 3H₂ How many grams of aluminum sulfate would be formed if 250g H₂SO₄ completely reacted with aluminum?

• a. 0.85 g

• b. 290 g

• c. 450 g

• d. 870 g

Tags

NGSS.HS-PS1-7