Step-by-step explanation:
To calculate the density of SO3 gas at STP, we need to know the molar mass of SO3 and the molar volume of any gas at STP. The molar mass of SO3 can be found by adding the atomic masses of sulfur and oxygen, which are 32.06 g/mol and 15.99 g/mol respectively. The molar mass of SO3 is 80.066 g/mol. The molar volume of any gas at STP is 22.4 L/mol, which means that one mole of gas occupies 22.4 liters at standard temperature and pressure. The density of a substance is defined as its mass per unit volume, so we can use the formula:
density=volume/mass
To find the density of SO3 gas at STP, we substitute the molar mass and the molar volume into the formula:
density=22.4 L/mol80.066 g/mol
density=3.57 g/L
The density of SO3 gas at STP is 3.57 g/L. This means that one liter of SO3 gas weighs 3.57 grams at standard temperature and pressure.