Question

mass of atom in 5 moles calcium carbonate in amu...
PL answer fast

Answer 1

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Molar mass relates the mass of a substance to the moles of the substance (g/mol). The mole in chemistry is sometimes called the chemist's ''dozen'' because it's a counting unit like a dozen. Just like there are 12 donuts in a dozen, there is 6.02 x 1023 atoms or molecules in a mole. Molar mass tells chemists how many grams of a substance are needed for 6.02 x 1023 atoms or molecules.

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Answer 2

Answer : 102.4 amu

Step-by-step explanation :

Since we know that,

Atomuc mass of Ca = 40 g/mol
C = 12 g/mol and O = 16 g/mol

So molecular mass of CaCO3

= ( 40 + 12 + 16 × 3 ) g/mol

= 100 g/mol

This means that,

1 mole of CaCO3 weigh = 100 g

Then 5 moles of CaCO3 = 5 × 100 g

= 500 g

Now, 1 mole = 6.022 × 10²³ atoms

5 moles = 5 × 6.022 × 10²³ atoms

= 30.11 × 10²³ atoms or 3 × 10²⁴ atoms

So, 3 × 10²⁴ atoms weigh = 500 g

1 atom weigh = 500 / ( 3 × 10²⁴ ) g

= 166.7 × 10-²⁴ g or 1.667 × 10² × 10-²⁴

= 1.7 × 10-²² gram

Now, 1 gram = 6.022 × 10²³ amu

= 1.7 × 10-²² × 6.022 × 10²³ amu

= 10.24 × 10¹ amu or 102.4 amu