One mole (mol) of ethanol (C2H60) has a mass of 46.0684 g. How many moles of ethanol are in an 18.0 g sample?

Need to see how the calculation was done.

Fill in the blanks for the following statements: the rms speed of the molecules in a sample of h2 gas at 300 k will be times larger than the rms speed of o2 molecules at the same temperature, and the ratio µrms (h2) / µrms (o2) with increasing temperature. a not enough information is given to answer this question b sixteen, will not change c four, will not change d four, will increase e sixteen, will decrease