A sample of sodium has a mass of 46 g. What is the mass of the same number of calcium atoms as sodium atoms present in given sample ?

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46 g

20 g

40 g

80 g

answer is D.

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Detailed Solution

Number of sodium $= \frac{46}{23} = N_{A} = 2 N_{A}$
Number of calcium atoms = Number of sodium atoms = 2N_A
Mass of ca atoms = $= \frac{2 N_{A}}{N_{A}} \times 40 = 80 g$

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