Question

71g of HCl (H=1 , Cl=35.5)

Answer 1

1(35 .5) I hope this helps you

Answer 2

The molar mass of a substance is calculated by summing up the product of the relative atomic mass and number of atoms of all the elements that make up the substance as expressed in its chemical formula. For an element, the molar mass is the atomic mass of the element.

For example: calculate the molar mass of the following substances:

1. Water, H2O

The relative atomic masses of the elements in water, H2O are: H = 1, O = 16.

Therefore, the molar mass is: relative atomic mass of hydrogen x number of atoms of hydrogen + relative atomic mass of oxygen x number of atoms of hydrogen.

This is expressed as 1x2 + 16x1 = 2 + 16 = 18

The molar mass of water, H2O is therefore 18g/mol

2. Hydrochloric acid, HCl

The relative atomic masses of the elements in hydrochloric acid, HCl are H = 1, Cl = 35.5.

The molar mass is calculated as follows: relative atomic mass of H + relative atomic mass of chlorine, which is 1 + 35.5 = 36.5g/mol

3. Tetraoxosulphate(VI) acid, H2SO4

The relative atomic masses of the elements in H2SO4 are: H = 1, S = 32, O = 16.

Calculating the molar mass, we have: 1x2 + 32 + 16x4

= 2 + 32 + 64 = 98

The molar mass of H2SO4 is 98g/mol

4. Glucose, C6H12O6

The relative atomic masses of elements in C6H12O6  are: C = 12, H = 1, O = 16.

Calculating the molar mass, we have: 12x6 + 1x12 + 16x6

= 72 + 12 + 96 = 180

Therefore, the molar mass of glucose is 180g/mol

5. Calcium trioxocarbonate(IV), CaCO3

The relative atomic masses of elements in CaCO3 are Ca = 40, C = 12, O = 16

Calculating the molar mass, we have: 40 + 12 + 16x3

= 40 + 12 + 48 = 100

Therefore, the molar mass of CaCO3 is 100g/mol

6. Sucrose, C12H22O11