Given:
P = 756.0 torr
= (756.0/760) atm
= 0.9947 atm
V = 115.0 mL
= (115.0/1000) L
= 0.115 L
T = 87.0 oC
= (87.0+273) K
= 360 K
find number of moles using:
P * V = n*R*T
0.9947 atm * 0.115 L = n * 0.08206 atm.L/mol.K * 360 K
n = 3.872*10^-3 mol
mass(solute)= 0.555 g
use:
number of mol = mass / molar mass
3.872*10^-3 mol = (0.555 g)/molar mass
molar mass = 1.433*10^2 g/mol
Answer: 143 g/mol
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please solve for me as always!
Thanks you very much.
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