I need the answer to this multiple-choice

Find the number of moles of argon in 364g of argon.

Concentrations expressed as a percent by mass are useful when the solute is a a. liquid b. gas c. solid

Select the statement that describe chemical properties a. antacid tablets neutralize stomach acid b. helium is the lightest monatomic element c. water freezes at 0 celsius d. mercury is liquid at room temperature