How many moles of helium gas are contained in a 43.0 L flask at STP?A.0.089 molB.89 molC.0.045 molD.0.17 mol

To solve this problem, we need to use the molar volume of a gas at Standard Temperature and Pressure (STP), which is 22.4 L/mol.

Step 1: Identify the given volume and the molar volume at STP. Given volume (V) = 43.0 L Molar volume at STP = 22.4 L/mol

Step 2: Use the formula for moles (n) which is the given volume divided by the molar volume. n = V / molar volume n = 43.0 L / 22.4 L/mol

Step 3: Calculate the number of moles. n = 1.92 mol

So, none of the options A, B, C, or D are correct. The number of moles of helium gas in a 43.0 L flask at STP is approximately 1.92 mol.