We’re being asked to **determine the mass** of **2.00 moles of gas** at **standard temperature and pressure**, given its** ****density**.

Recall that ** standard temperature and pressure (STP)** is defined as 1 atm and 0 ˚C.

The ** density of a gas** is given by:

$\overline{){\mathbf{d}}{\mathbf{=}}\frac{\mathbf{PM}}{\mathbf{RT}}}$

where:

**P** = pressure (in atm) **R** = gas constant (0.08206 atm • L/mol • K)

**T** = temperature (in K) **M** = molar mass

**d** = density

The density of a gas is 1.96 g/L at STP. What would the mass of 2.00 moles of the gas be at STP?

1. 87.8 g

2. There is not enough information to solve.

3. 44.8 g

4. 0.0875 g

5. 43.9 g

6. 0.510 g

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