# Answer to Question #55803 in General Chemistry for jocelyn

Question #55803

calculate the number of mol of helium in a 1.20-L balloon at 29C and 2.10 atm of pressure.

answer in scientific notation.

answer in scientific notation.

Expert's answer

The ideal gas law is:

PV=nRT

where the letters denote pressure(P), volume(V), amount (n, in moles), ideal gas constant(R), and temperature of the gas(T).

Then

n = PV/RT = 2.10*1.20/(0.082*(273+29)) = 0.102 moles

PV=nRT

where the letters denote pressure(P), volume(V), amount (n, in moles), ideal gas constant(R), and temperature of the gas(T).

Then

n = PV/RT = 2.10*1.20/(0.082*(273+29)) = 0.102 moles

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