Q11. the three hydrides, HCI, HF and CH4 are placed in order of increasing boiling point (from left to right), which of the following is correct?
A-CH4, HF, HCI
B-HF, CH4, HCI
C-CH4, HCI, HF
D-HCI, CH4 HF

A. CH4 , HF , HCl

Explanation:

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number of molecules / avogadro's number * molecule molecular = mass

explanation:

we define a gram-molecular weight as the mass of one mole of any element or compound. a mole contains avogadro's number of units (molecules) –  

6.022

x

10

23

. so, dividing the number of molecules by avogadro's number gives us the number of moles. multiplying that by the molecular weight gives us the mass. from the periodic table we find the gram-molecular weight of u to be238 and of f to be19. so,  

u

f

6

will have a gram-molecular weight of 352g.