Chemistry
Grade-9
Easy
Question
Calculate the following for 49 gm of H2SO4.
- a-3, b-1, c-2, d-4
- a-1, b-2, c-3, d-4
- a-2, b-3, c-4, d-1
- a-1, b-2, c-4, d-3
Hint:
Molecular mass of H2SO4 = 2(1) + 32 + 4(16) = 98g
The correct answer is: a-3, b-1, c-2, d-4
Molecular mass of H2SO4 = 2(1) + 32 + 4(16) = 98g
Number of moles is 49 g = 49 
98 = 0.5
In 1 mole number of molecules = 6.022 
1023, in 0.5 mole number of molecules = (6.022 1023) 0.5 = 3.011 1023
1 mole contains 50 electrons (2 + 16 + 32), as atomic number is equal to number of electrons. Therefore, 3.011 1023 molecules contains 503.011 1023 = 1.5055 1025 e-
1 mole has 2 6.022 1023 H atoms, 0.5 moles have 6.022 1023 atoms.
a-3, b-1, c-2, d-4
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