1. how many liters are in 10 grams of helium (he)?

Explanation:

Step1: Find molar mass of He

The molar mass of helium ($He$) is approximately $4\ g/mol$.

Step2: Calculate number of moles

Use the formula $n=\frac{m}{M}$, where $m = 10\ g$ (mass) and $M = 4\ g/mol$ (molar - mass). So, $n=\frac{10\ g}{4\ g/mol}=2.5\ mol$.

Step3: Use molar volume at STP

At standard temperature and pressure (STP), the molar volume of any gas is $22.4\ L/mol$. To find the volume $V$ of the gas, use the formula $V=n\times V_m$, where $n = 2.5\ mol$ and $V_m=22.4\ L/mol$. So, $V = 2.5\ mol\times22.4\ L/mol = 56\ L$.

Answer:

$56\ L$