What is the mole-to-mole ratio for hydrogen and oxygen in the balanced equation: 2 H₂ + O₂ -> 2 H₂O?

• 1:2

• 1:1

• 3:1

• 2:1

How many moles of H₂O are produced when 4 moles of O₂ react? 2 H₂ + O₂ -> 2 H₂O

• 8 mol

• 2 mol

• 6 mol

• 10 mol

• 2:3

• 1:2

• 1:3

• 3:2

___KNO₃ → ___KNO₂ + ___O₂

What coefficients are needed to balance the reaction?

• 2, 2, 1

• 2, 3, 2

• 1, 2, 2

• 1, 3, 1

Using the following equation:
Fe₂O₃(s) + 3H₂(g) → 2Fe(s) + 3H₂O(l)
How many moles of iron can be made from  6 moles H₂? 

• 4 moles Fe
• 6 moles Fe
• 9 moles Fe
• 2 moles Fe

In the reaction 2H₂ + O₂ → 2H₂O, what is the mole ratio of hydrogen to water?

• 2 : 2

• 2 : 1

• 1 : 2

• 4 : 4

What is the molar mass of NaCl?

• 58.45g/mol
• 28g/mol
• 12g/mol
• 6.02 x 10²³

How many moles of carbon atoms are there in 5g of carbon?

• 60 mol
• 17 mol
• 0.42 mol
• 7 mol

If I need 20.4 moles of sodium chloride, how much should I weigh out?

• 0.549 g
• 112 g
• 1192 g
• 5077 g

What does the Law of Conservation of Mass state?

• Matter cannot be gained or lost in a chemical reaction.
• Matter can only be lost in a chemical reaction.
• Matter can only be gained in a chemical reaction.
• Matter can be gained and lost in a chemical reaction.