How many moles of gas are contained in a scuba diver's 12.6-L tank filled with 3422 psi of air at 25 °C?

Name: How many moles of gas are contained in a scuba diver's 12.6-L tank filled with 3422 psi of air at 25 °C?
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Using the ideal gas law, $PV = nRT$, where $P$ is pressure, $V$ is volume, $n$ is the number of moles, $R$ is the ideal gas constant, and $T$ is temperature. First, convert units: 3422 psi to atm (1 atm = 14.696 psi), and 25 °C to Kelvin (K = °C + 273.15). Then, solve for $n$.

How Many Moles of Gas Are Contained in a Scuba