Q3 Review: Molar Relationships & States of Matter

How many molecules are in 2.1 moles of CO₂?

• 3. 5 x 10^-24

• 1.26 x 10²⁴

• 44

• 92.4

How many moles are in 5.0 L of Ar gas (at STP)

• 0.22 moles

• 112 moles

• 1 mole

• 0.125

What is the mass in grams of 5.9 mol C₈H₁₈?

• 114.23 grams

• 674 grams

• 0.05 grams

• 1 gram

What is the empirical formula for C₃H₆?

• C₂H

• CH₂

• C₃H₆

• CH₃

What is the empirical formula for C₁₂H₂₂O₁₁?

• CH₂O

• C₁₂H₂₂O₁₁

• C₆H₁₁O₆

• CH₃

What is the empirical formula for C₂H₄Br₂?

• C₂H₄Br₂

• CH₂Br

• C₂HBr₂

• CHBr

A compound consists of 75% carbon and 25% hydrogen by mass. What is the empirical formula?

• C₂H₄

• CH₄

• CH

• C₃H₆

A 88.0 g sample of a compound consisting of carbon and hydrogen contains 81.2 g of carbon and 6.8 g of hydrogen. What is the empirical formula?

• C₂H₄

• CH₄

• CH

• CH₂

Tags

NGSS.HS-PS1-1

Using the following equation: Fe₂O₃ + 3H₂ → 2Fe + 3H₂O, If 6 moles of H₂ reacted, how many moles of iron are produced?

• 4 moles Fe

• 3 moles Fe

• 2 moles Fe

• 6 moles Fe

C₃H₈ + 5O₂ ​​→ 3CO₂ + 4H₂O, If 1.00 liter of oxygen gas is used, how many liters of carbon dioxide will be produced at standard temperature and pressure (STP)?

• 0.6 L

• 6 L

• 1 L

• 0.3 L

Tags

NGSS.HS-PS1-7