The number of molecules in 32 g of methane is:
(a) 3.0x1023
(b) 12.04x1023
(c) 6.02x1023
(d) 2.4x1023
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The number of molecules in 32 g of methane is:
(a) 3.0x1023
(b) 12.04x1023
(c) 6.02x1023
(d) 2.4x1023
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Verified answer
Answer:-
12.04×10²³ molecules [Option.b]
Explanation:-
Given:-
→ Mass of Methane = 32g
To find:-
→ Number of molecules in 32g
of methane.
Solution:-
• Molar mass of Carbon (C) = 12g/mol
• Molar mass of Hydrogen (H) = 1g/mol
Hence, molar mass of Methane [CH₄] :-
= 12+ 1×4
= 16g/mol
Number of moles in 32g of Methane :-
= Given mass/Molar mass
= 32/16
= 2 moles
Hence, 2 moles are there.
Number of molecules :-
= No of moles × Avogadro Number
• Avogadro Number = 6.022×10²³
= 2×6.022×10²³
= 12.04×10²³ molecules
Thus, 12.04×10²³ molecules are there is 32g of methane.