Mass, Volume, Density#!#Temperature#!#Significanat notation#!#Accurate and Precise

Mass And Weight|Volume|Numerical|Density|Pressure|Temperature|Dalton's Atomic Theory|OMR

The density of a certain mass of a gas at STP is d . If the pressure of the gas is doubled and the temperature is made one-third of its initial value, the new density will be

An object of mass 4.237 g occupies a volume 1.72 cm^3 . The density of the object to appropriate significant figures is -