What is the molar mass of water (H2O)?

• 18 g/mol

• 20 g/mol

• 16 g/mol

• 22 g/mol

Tags

NGSS.HS-PS1-7

In the reaction @@ ext{2H}_2 + ext{O}_2 ightarrow ext{2H}_2 ext{O}@@, how many moles of water are produced from 4 moles of hydrogen gas?

• 2 moles

• 4 moles

• 6 moles

• 8 moles

Tags

NGSS.HS-PS1-7

What is the limiting reactant in the reaction @@ ext{2H}_2 + ext{O}_2 ightarrow ext{2H}_2 ext{O}@@ if you start with 5 moles of H2 and 2 moles of O2?

• H2

• O2

• H2O

• None

Tags

NGSS.HS-PS1-7

How many grams of CO2 are produced from 44 grams of propane (C3H8) in the reaction @@ ext{C}_3 ext{H}_8 + 5 ext{O}_2 ightarrow 3 ext{CO}_2 + 4 ext{H}_2 ext{O}@@?

• 132 g

• 88 g

• 44 g

• 176 g

Tags

NGSS.MS-PS1-5

What is the empirical formula of a compound that contains 40% carbon, 6.7% hydrogen, and 53.3% oxygen by mass?

• CH2O

• C2H4O2

• C3H6O3

• CHO

In a balanced chemical equation, the coefficients represent the ratio of what?

• Moles

• Grams

• Liters

• Atoms

What is the percent yield if 50 grams of product is obtained from a reaction with a theoretical yield of 60 grams?

• 83.3%

• 75%

• 90%

• 100%

Tags

NGSS.HS-PS1-7

Which of the following is a correct interpretation of the balanced equation @@ ext{N}_2 + 3 ext{H}_2 ightarrow 2 ext{NH}_3@@?

• 1 mole of N2 reacts with 3 moles of H2 to produce 2 moles of NH3

• 2 moles of N2 react with 3 moles of H2 to produce 1 mole of NH3

• 3 moles of N2 react with 1 mole of H2 to produce 2 moles of NH3

• 1 mole of N2 reacts with 2 moles of H2 to produce 3 moles of NH3

How many liters of oxygen gas at STP are required to completely react with 22.4 liters of hydrogen gas?

• 11.2 L

• 22.4 L

• 33.6 L

• 44.8 L

What is the mass of 1 mole of NaCl?

• 58.44 g

• 60 g

• 55 g

• 50 g