GK
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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How many moles are 2.85 x 1018 atoms of iron?
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4.73 x 10-6 moles
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1.72 x 1042 moles
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1.72 x 10-42 moles
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4.73 x 106 moles
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Explanation:
Detailed explanation-1: -2.85 x 10^24 / 6.02 x 10423 = 4.73 mol Fe.
Detailed explanation-2: -Therefore 2.80x10^24 atoms are present in = 2.8x10^24/6.02x10^23 = 4.65 moles of Si.
Detailed explanation-3: -Iron has a molar mass of 55.84 grams/mole. So, five grams divided by 55.84 grams/mole gives us 0.089 moles of iron.
Detailed explanation-4: -1.5x1020 molecules = 2.5x10-4 moles.
There is 1 question to complete.