20. What size container do you need to hole 0.0459 mol of N2 gas at STP?

0.0459 mol *22.4L = 1.03 L1 mol

22. What volume in milliliters will 0.00922g of H2 gas occupy at STP?

0.00922 g 1 mol = 0.00457 mol 2.0 g

0.00457 mol* 22.4 L = 0.102 L

or 102 mL1 mol

24. Calculate the volume that 4.5kg of ethylene gas (C2H4) will occupy at STP.

¿𝟑 .𝟔 𝒙𝟏𝟎𝟑 𝑳

4.5𝑘𝑔𝑥1000𝑔1𝑘𝑔

𝑥1𝑚𝑜𝑙28.00𝑔

𝑥22.4 𝐿1𝑚𝑜𝑙

26. Determine the Celsius temperature of 2.49 mol of a gas contained in a 1.00-L vessel at a pressure of 143 kPa.

143𝑘𝑃𝑎 𝑥1.00𝑎𝑡𝑚101.3𝑘𝑃𝑎 ¿1.41𝑎𝑡𝑚

𝑇=(1.41𝑎𝑡𝑚 ) (1.00𝐿 )

(2.49𝑚𝑜𝑙 )(0.0821 𝐿∗𝑎𝑡𝑚𝑚𝑜𝑙∗𝐾

)¿6.90𝐾

6.90𝐾−273¿−𝟐𝟔𝟔℃

27. Calculate the volume of a 0.323-mol sample of a gas at 265 K and 0.900 atm.

¿𝟕 .𝟖𝟏𝑳

28. What is the pressure, in atmospheres, of a 0.108-mol sample of helium gas at a temperature of 20.0 oC if its volume is 0.505 L

𝑇=20.0℃+273¿293𝐾

𝑃=(0.108𝑚𝑜𝑙 )(0.0821 𝐿∗𝑎𝑡𝑚𝑚𝑜𝑙∗𝐾 )(293𝐾 )

0.505𝐿

¿𝟓 .𝟏𝟒𝒂𝒕𝒎

29. If the pressure exerted by a gas at 25 oC in a volume of 0.044 L is 3.81 atm how many moles of gas are present?

¿𝟔 .𝟗 𝒙𝟏𝟎−𝟑𝒎𝒐𝒍

𝑛=(3.81𝑎𝑡𝑚 )(0.44𝐿)

(0.0821 𝐿∗𝑎𝑡𝑚𝑚𝑜𝑙∗𝐾 )(298𝐾 )