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## A sample of 7.55 g of He has a volume of 5,520 mL and a temperature of 123°C. What is its pressure in torr?

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## Answers ( )

Answer: The pressure is 8451.2 torr.Explanation:Given:Mass of He = 7.55 gVolume = 5520 mL

Convert mL into L as follows.

Temperature =

Now, moles of He (molar mass = 4.00 g/mol) are as follows.Formula used to calculate pressure is as follows.PV = nRT

where,

P = pressure

V = volume

n = no. of moles

R = gas constant = 0.0821 L atm/mol K

T = temperature

Substitute the values into above formula as follows.Convert atm into torr as follows.1 atm = 760 torr

Thus, we can conclude that

the pressure is 8451.2 torr.