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Q.

48g of Mg contains the same number of atoms as 160g of another element. The atomic mass of the element comes out to be A which is further divided by 20. What is the final answer.

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answer is 4.

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Detailed Solution

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Molar mass of Mg is 24 u and 48 g of Mg has 2 moles of Mg.

Number of atoms=48 g24 g×6.022×1023Na2Na

Element has the same number of atoms and mass is 160 g. Its molar mass is:

Number of atoms=given massmolar mass×6.022×1023 2Na=160 gmolar mass×Na molar mass=160 g2=80 gA

Final answer when 80 is further divided by 20 is 4.

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