General Chemistry 1: Ideal Gas Law

An ocean dwelling dinosaur has an estimated body volume of 1.38 x 10$^6$ cm$^3$. The animals's live mass was estimated at 1.24 x 10$^6$ g. What is its density?

A student collected a gas in an apparatus connected to an open end manometer. The difference in heights of mercury in the two columns was 102 mm and the atmospheric pressure was measured to be 756 mmHg. What was the pressure of the gas in the apparatus in atm?

Suppose a 1.25 g sample of CaCO$_3$ is decomposed by heating. How many milliliters of CO$_2$ gas will be evolved if it will be measured at 0.974 atm and 25 $^{\circ}$C (MM of CaCO$_3$ = 100.05 g/mol)

CaCO$_3$ (s) $\longrightarrow$ CO$_2$ (g) + CaO (s)