Josh prepares a solution by mixing sodium nitrate and water. to calculate the molarity of the solution, josh should calculate the moles of which substance, and why?
we can use the ideal gas law to solve this problem:
pv = nrt
since n = m/m, the equation becomes
pv = (m/m)rt multiply each side by m
pvm = mrt divide each side by pv
m = (mrt)/(pv)
ρ = 2.50 g/l
r = 0.082 16 l·atm·k⁻¹mol⁻¹
t =98 °c
p = 740 mmhg
(a) convert temperature to kelvins
t = (98 + 273.15) = 371.15 k
(b) convert pressure to atmospheres
p = 740 × 1/760 =0.9737 atm
(c) calculate the molar mass
assume v = 1 l.
then m = 2.50 g
m = (2.50 × 0.082 06 × 371.15)/(0.9737 × 1)
= 78.2 g/mol
if the cabin air pressure is lower, there is less air for unit volume.
i'm pretty sur this is correct. i hope this !
you can obtain the atomic mass of any chemical element by using the periodic table.
the molar mass is usually listed underneath the chemical symbol. the units associated with molar mass is grams per mole .
idk yall needa answer this one im tryna graduate over here