Answer:
To calculate the mass of 2.007 moles of propane gas (C3H8), we need to first determine its molar mass.
The molar mass of propane (C3H8) can be calculated as:
3(C) + 8(H) = (3 x 12.01 g/mol) + (8 x 1.01 g/mol) = 44.11 g/mol
Therefore, the mass of 2.007 moles of propane is:
Mass = 2.007 moles x 44.11 g/mol = 88.46 g
So, the mass of 2.007 moles of propane gas (C3H8) is 88.46 g.