# Worksheet: Unit Conversions

In this worksheet, we will practice converting between different units that are commonly used to express physical quantities.

**Q15: **

N_{2} gas has a molar mass of 28.0 g/mol, and CO_{2} gas has a molar mass of 44.0 g/mol.

How many moles are in 0.0500 g of N_{2} gas?

- A
- B
- C
- D
- E

How many moles are in 10.0 g of CO_{2} gas?

How many molecules are in 0.0500 g of N_{2} gas?

- A
- B
- C
- D
- E

How many molecules are in 10.0 g of CO_{2} gas?

- A
- B
- C
- D
- E

**Q16: **

A light-nanosecond is the distance that light travels in a vacuum in exactly 1 ns. How many light-nanoseconds equal 1 foot if a foot is equal to 0.3048 m? Use m/s for the speed of light in a vacuum.

- A 0.98 light-nanoseconds
- B1.02 light-nanoseconds
- C light-nanoseconds
- D light-nanoseconds
- E light-nanoseconds