Question

At STP, what is the volume of 55.0 g of BF3?

Answer 1

The volume of 55 grams of BF₃ is 18.1664 L.

Step-by-step explanation:

If the molar mass of compound BF₃ is 67.81
`(grams)/(mole)`, then the number of moles 55 grams of compound contains is calculated as:

`55 grams* (1 mole)/(67.81 grams) = 0.811 moles`

The STP conditions refer to the standard temperature and pressure. Pressure values at 1 atmosphere and temperature at 0 ° C are used and are reference values for gases. And in these conditions 1 mole of any gas occupies an approximate volume of 22.4 liters.

Then it is possible to apply the following rule of three: if by definition of STP 1 mole of a compound occupies 22.4 L, 0.811 moles of the compound occupies how much volume?

`volume=(0.811 moles* 22.4 L)/(1 mole)`

volume= 18.1664 L

The volume of 55 grams of BF₃ is 18.1664 L.