Question

(a) Define gram molecular mass of a substance. How much is the gram molecular mass of oxygen?
(b) If sulphur exists as S8 Molecules, calculate the number of moles in 100 g of sulphur. (S = 32 u)

Answer 1

Answer:

so sorry I don't know..

Answer 2

(a) Thus, gram molecular molecule mass of oxygen (O2) = (2 *16) = 32 g .

(b) number of moles = 0.3906

Explanation:

(a) Gram mass of molecular is classified as the mass of one mole of molecular material in grams, or simply equal to the total of all atomic masses in a compound's molecular formula in grams.

The Atomic Oxygen Mass (O) = 16

Thus, gram molecular molecule mass of oxygen ($O_{2}$) = (2 *16) = 32 g

(b) STEP:1 Sulphur atomic mass (S) = 32 u

Sulphur Molecular mass ($S_{8}$)= 8 * 32 = 256 u

Given sulphur mass  ($S_{8}$) = 100 g

STEP:2 Number of moles = $\frac{mass (grams )}{molecular (mass)}$

$=\frac{100}{256}$

=0.3906

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