Explain what is meant by molar mass

Molar mass is the physical property defined as the mass of a given substance divided by the amount of substance.

For example, the atomic mass of titanium is 47.88 amu or 47.88 g/mol. In 47.88 grams of titanium, there is one mole, or 6.022 x 1023 titanium atoms.

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