Molar Volume

[匿名]

2007-11-06 1:31 am

Please help me to solve the questions about molar volume. Thx a lot.

1) 1.35g of a certain compound vaporized at room condition were found to occupy 524cm^3. What is the molar mass of the compound.

2) A vessel of volume 500cm^3 contains 1.48 g of a certain gas at room temperture and pressure. Find
(a) number of moles of the gas
(b) number of molecules of the gas
(c)molar mass of the gas

回答 (1)

Audrey Hepburn

2007-11-06 2:57 am

✔ 最佳答案

By Avogadro’s Law, 1 mole of gas occupy 24.0 dm3 of volume in room condition.

1. No. of mole of the compound

= Volume / Molar volume

= 524 / 24 000

= 0.0218 mol

Molar mass of the compound

= Mass / No. of mole

= 1.35 / 0.0218

= 61.8 gmol-1

2. Number of mole

= Volume / Molar volume

= 500 / 24 000

= 0.0208 mol

b. Number of molecules

= No. of mole X Avogadro’s number

= 0.0208 X (6.02 X 1023)

= 1.25 X 1022

c. Molar mass

= Mass / No. of mole

= 1.48 / 0.0208

= 71.04 gmol-1

參考: Myself~~~

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