I need help boys-girls

What is the molar mass of a gas that has density of 2.054 g/l

An engineer decides to use a slightly weaker material rather than a stronger material, since she knows that the stronger material can break suddenly. this is an example of what? a choosing a material that will show warning before it fails b using composite materials that combine strength c using a material for multiple applications d using design techniques that increase efficiency and reduce cost

What is the volume of 3.2 moles of chlorine gas (cl2) at 295 k and 1.1 atm?