usernamenew
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which of these contains the greatest number of atoms?
A 127 mg of iodine
B 1.54 × 10−4 kg of phosphorus
C 81.0 mg of carbon dioxide
D 1.70 × 10−4 kg of ammonia
I converted A and C to kg
A= 1.27x10-4kg
C=8.7x10-5kg
but still not sure which is the biggest? why is it D
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ChemistryWebsite
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(Original post by usernamenew)
which of these contains the greatest number of atoms?
A 127 mg of iodine
B 1.54 × 10−4 kg of phosphorus
C 81.0 mg of carbon dioxide
D 1.70 × 10−4 kg of ammonia
I converted A and C to kg
A= 1.27x10-4kg
C=8.7x10-5kg
but still not sure which is the biggest? why is it D
Easiest way (in my opinion) is :

1. Calculate the number of moles of each substance in the mass stated. You may find it easier to use grams rather than converting them all to kg.
2. Multiply by the number of atoms per molecule to find the number of atoms in each.
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