Question

→_→calculate the molar mass of following substance
1)Ethyne,C2H2
2) Sulphur molecule,S8


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Answer 1

Answer:

26.04 g/mol

Acetylene/Molar mass

Explanation:

Molar mass of C

2

H

2

=2×atomic mass of C+2×atomic mass of H

=2×12+2×1=26u

(b) Molar mass of S

8

=8×atomic mass of S

=8×32=256u

(c) Molar mass of P

4

=4×atomic mass of P

=4×31=124u

(d) Molar mass of HCl=atomic mass of Cl+atomic mass of H

=35.5+1=36.5u

(e) Molar mass of HNO

3

=atomic mass of H+atomic mass of N+3×atomic mass of O

=1+14+3×16=63u

Answer 2

Explanation:

a) Ethyne, C2H2

Molar mass of ethyne, C2H2 = 2 x 12 + 2 x 1 = 26

b) Sulphur molecule, S8

Molar mass of sulphur molecule, S8 = 8 x 32 = 256 g

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