How many moles of hydrogen gas are contained in 21.3 L at stp?

Mar 9, 2018

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Explanation:

STP is standard temperature and pressure, 273.15K and 1 atm.

We'll use the ideal gas law to sort this out.

$P V = n R T$, and solve for n; $R = 0.0821 \text{L*atm"/"mole*K}$

$n = \text{PV"/"RT}$

n = "1atm*21.3L"/("0.0821"(L*atm"/"mol*K)"*273.15K")

$n = 0.950 \text{moles} {H}_{2}$