Atomic weight of gold is 197.2 ami

Calculate no of gram atoms in 7.5g of gold

The atomic weight is numerically equivalent to the molar mass.

therefore molar mass of gold is - 197.2 g/mol

avagadros number states that 1 mol of any substance is made of 6.022 x 10²³ units. These units could be atoms making up elements or molecules making up compounds.

1 mol of gold is made of 6.022 x 10²³ atoms of gold

since 1 mol weighs 197.2 g

therefore if 197.2 g of gold contains - 6.022 x 10²³ atoms of gold

then 7.5 g contains - 6.022 x 10²³ x 7.5 / 197.2 = 2.29 x 10²² atoms of gold

answer is 2.29 x 10²² atoms of gold