What is the molar mass of a gas if 1.25 g of the gas has a volume of 255 l at stp?

0.11g/mol

Explanation: 1mole of any gas contains 22.4L at stp.

Xmol of the gas will contain 255L i.e

Xmol of the gas = 255/22.4 = 11.38moles

recall

n = Mass conc. / molar Mass

Molar Mass = Mass conc. / n

Molar Mass = 1.25/11.38 = 0.11g/mol

it is important to conserve water because there is very limited amount of freshwater here on earth and if we are not smart about how we use it we will only be runnning out of our supply faster than neccessarry.

c. heat could easily travel through the molecules in the air and escape/enter the flask. removing the air slows down the heat transfer.