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Mashutka [201]
3 years ago
15

An atom of magnesium has an atomic number of 12 and a mass number of 24. how many protons plus neutrons are in the nucleus

Chemistry
1 answer:
docker41 [41]3 years ago
6 0
12 Protons
12 Neutrons
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What is the mass of 5 moles of Fe2(CO3)3 ?
sineoko [7]

Answer:

1218.585

Explanation:

Looking at the subscripts we know there are 2 atoms of Fe, 3 atoms of C, and 6 of O.

Take the molar mass of each atom (from the periodic table) and multiply by the # of atoms

Fe: 55.845×2= 111.69

C: 12.011×3= 36.033

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Add the values together: 243.717 g/mol

That is 1 mole of the molecule. Multiply by 5 for the final answer.

243.717×5=1218.585

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