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Question

An alloy of iron (54.7%), nickel (45%) and manganese (0.3%) has a density of 8.17 g/cm3. How many iron atoms are present in a block of the alloy measuring 10 cm×20 cm×15 cm?

A
1.422×1026
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B
1.422×1023
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C
6.23×1023
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D
1.656×1026
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