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

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 )