I need help with this chemistry problem, please explain your answers if it isn't too much trouble.

Question

3. The diagrams below represent equal volumes of four different gases. Use the diagrams to

answer the following questions:

a. Are these gases at the same temperature and pressure? How do you know?

b. If the molar mass of gas B is 38 g/mol and that of gas C is 46 g/mol, which gas sample is

denser? Explain your answer.

c. To make the densities of gas samples B and C equal, which gas should expand in

volume?

d. If the densities of gas sample A and C are equal, what is the relationship between their molar masses?

Answer 1

(a). They would be at the same temperature and pressure since the volumes all appear to be equal. This assumes that the containers are expandable.

(b). Gas C would be denser (more dense). This is because density is defined as mass/volume and if the volumes are the same, and the number of moles is the same (4 in each case), then for gas C you'd have a greater mass per unit volume, which translates into a greater density.

(c). To equalize the densities of B and C, the volume of C should increase, thus reducing the density.

(d). A has 7 moles of gas and C has 4 moles of gas, so if densities are the same, then the molar mass of A must be 4/7 that of gas C