Question

An unknown amino acids has 0.032% by wt.sulphur.If each molecule has one S atom only,1 gram of amino acid has ___ molecules

Answer 1

Answer:

I thinks so 3 molecules

Answer 2

Answer:

6.02 x 10^18 molecules.

Explanation:

From the given percentage we can find the weight of the Sulphur, since 0.032% of sulphur in 100g will be 0.032g of sulphur.

Hence, there is 0.032 g Sulphur in 100 g of the amino amino acid.  

so, 0.00032 g of the S is present in 1 g of the amino acid.  

Therefore, the number of moles of S = given mass /gram atomic mass.

= 0.00032 g / 32 g/mol which will be equal to 0.00001 moles.  

So, in 6.02 x 10^23 molecules there will be 0.00001 moles*6.02 x 10^23 molecules thus on solving we will get that 1 g of amino acid has 6.02 x 10^18 molecules.