Molar mass of CO2,
MM = 1*MM(C) + 2*MM(O)
= 1*12.01 + 2*16.0
= 44.01 g/mol
Molar mass of He = 4.003 g/mol
n(CO2) = mass of CO2/molar mass of CO2
= 5.0/44.01
= 0.1136
n(He) = mass of He/molar mass of He
= 3.75/4.003
= 0.9368
n(CO2),n1 = 0.1136 mol
n(He),n2 = 0.9368 mol
Total number of mol = n1+n2
= 0.1136 + 0.9368
= 1.0504 mol
Partial pressure of CO2,
p(CO2) = (n1*Ptotal)/total mol
= (0.1136 * 655)/1.0504
= 70.8 mmHg
Answer: 70.8 mmHg
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