Calculate the molar mass of a vapor that has a density of 6.535 g/L at 17°C and 825 torr.?

Answer 1

1 torr 101325 /760 Pa =133 Pa

825 torrs =133*825 = 1.1* 10^5 Pa

calculate n from pV = nRT in MKSA R = 8.31JK-1 1l = 10^-3 m^3

n= 1.1 10^5 *10^-3/ 8.31 * ( 273+17)= 0.045mole
so 0.045 mole weights 6.535

and 1 mole = 6.535 /0.045=144

Answer 2

to respond to this one and different further like it: PV=nRT. you desire density, this is g/mL or mass/quantity. the cost of "n" is the style of moles So the equation could nicely be changed to look like n/V=P/RT. The values given are P and T (R is your gas consistent) and additionally you will remedy for density (g/quantity) employing education per time-honored temperature and tension (STP) values.