A 25-cm-diameter cylinder that is 39 cm long contains 40 g of oxygen gas at 20°

Question

A 25-cm-diameter cylinder that is 39 cm long contains 40 g of oxygen gas at 20° C What is the number density of the oxygen? Express your answer using two significant figures. You may want to review (Pages 500-502) -3 n= 3.9x1025 m Previous Answers Correct Here we learn how to calculate the number density of the gas. Part D What is the reading of a pressure gauge attached to the tank? Express your answer to two significant figures and include the appropriate units xXb x.10n 1.7 10 Pa Previous Answers Request Answer X Incorrect; Try Again; 3 attempts remaining

Explanation / Answer

One mol of O2 has a mass of 32g so there are 40/32 = 1.25 moles

D) Using pV = nRT

we get

p = nRT/V

= 1.25*8.314*(20+273 K)/(pi*(0.25/2)^2*0.39)

= 1.6 x 105 Pa

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