Question

Gold sample contain 90% of gold and the rest copper how many atoms of gold are present in 1 g of this sample of gold

Answer 1

Given;

sample = 1g

thus 90% of the sample =

• 90/100 × 1
• 9/10 = 0.9g

thus moles of gold;

• n = W/M
• n = 9/10×197
• n = 1/10×0.04
• n = 100/10×4
• n = 2.5 moles

let NA = 6 × 10²³ fir approximate value

Thus number of atoms N is given by ;

• N = n×NA
• N = 2.5 × 6 × 10²³
• N = 15 × 10²³ atoms

#answerwithquality

#BAL

Answer 2

Answer:

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