`4.0 g` of helium occupies `22400 cm^(3)` at STP. The specific heat capacity of helium at constant pressure is `( 5.0 cal K^(-1) mol ^(-1))`. Calculate the speed of sound in helium at STP.

Explanation

To calculate the speed of sound in helium at STP, we will follow these steps:

### Step 1: Convert the specific heat capacity from calories to Joules
The specific heat capacity of helium at constant pressure (Cp) is given as 5.0 cal K^(-1) mol^(-1). We need to convert this into Joules.

\[ Cp = 5.0 \, \text{cal K}^{-1} \text{mol}^{-1} \times 4.2 \, \text{J cal}^{-1} = 21 \, \text{J K}^{-1} \text{mol}^{-1} \]
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