Choose the correct options for the following questions.
The mass of one mole of electrons is:
Difficulty: Easy
A:
1.088 mg
B:
0.184 mg
C:
0.54 mg
D:
1.673 mg
One mole of carbon 12 has mass:
Difficulty: Easy
A:
35.5 g
B:
23 g
C:
71 g
D:
32 g
The number of moles of hydrogen atoms in 3.2 g of methane $CH_{4}$ (Relative atomic mass of H=1 , C=12):
Difficulty: Easy
A:
0.8
B:
0.2
C:
0.6
D:
0.4
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