A gold sample contains 90% of gold and the rest copper. How many atoms

1.	A gold sample contains 90% of gold and the rest copper. How many atoms of gold are present in one gram of this sample of gold?
Answer» Answer: Relative Atomic Mass of GOLD = 197 Meaning 197 g of Gold CONTAINS 6.02 x 10∧23 atoms of Gold (Avogadro's No.) Mass of gold in the sample = 90% x 1 g = 0.9 g If 197 g ≡ 6.02 x 10∧23 atoms ∴ 0.9 g ≡ (0.9 x 6.02 x 10∧23) ÷ 197 ≡ 2.75 x 10∧21 atoms plz mark as brainliest answer

A gold sample contains 90% of gold and the rest copper. How many atoms of gold are present in one gram of this sample of gold?

Answer»

Answer:

Relative Atomic Mass of GOLD = 197

Meaning 197 g of Gold CONTAINS 6.02 x 10∧23 atoms of Gold (Avogadro's No.)

Mass of gold in the sample = 90% x 1 g = 0.9 g

If 197 g ≡ 6.02 x 10∧23 atoms

∴ 0.9 g ≡ (0.9 x 6.02 x 10∧23) ÷ 197

≡ 2.75 x 10∧21 atoms

plz mark as brainliest answer