F.4 Chem MC Need Reason!!!
Which of the following gases, each having a mass of 3.0 g, has the
largest no. of molecules at room temperature and pressure?
(Relative atomic masses: H= 1.0, C= 12.0, N= 14.0, O= 16.0, F= 19.0, Ar= 40.0)
B. Hydrogen fluoride
C. Carbon dioxide
Why the molar mass of Argon is 36? not 40?
- 六呎將軍Lv 71 decade agoFavorite Answer
First of all, comparing their molar mass:
Oxygen = 32 g/mol
Hydrogen fluoride = 20 g/mol
Carbon dioxide = 44 g/mol
Argon = 36 g/mol
Then for the same mass of each of them, the one with smallest molar mass will contain the largest no. of moles, i.e. hydrogen fluoride.
Ans = B
2009-08-02 12:13:21 補充：
Yes, Argon molar mass = 40
But this will not affect the ans of this Q
2009-08-03 12:13:32 補充：
Yes, but the ans is not affected, still BSource(s): Myself
- 1 decade ago
The molar mass of argon is = 40 g/mol