Question

Insulin contains 3.4% sulphur. The minimum mol weight of insulin is -
(1) 941.176
(2) 944
(3) 945.27
(4) none

Answer 1

3.4 = 32*100/Mw

Mw = 3200/3.4

Mw = 941.17 gm/mol

Answer 2

your answer will be 1
= 941.176

explanation

3.4 g S = 100g insulin
therefore
32g S =( 100×32)/3.4
= 941.176
insulin contain must at least 1 atom of S in its moleculas