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3 years ago

How many molecules are there in 345 grams of carbon dioxide?

Chemistry

2 answers:

rewona [7]3 years ago

8 0

Answer:

4.72 × 10²⁴ molecules

Explanation:

Number of mols of a substance = mass of substance/molar mass of substance

Mass of carbon dioxide (CO2) = 345g

Molar Mass of Carbon = 12

Molar Mass of Oxygen = 16

Molar mass of CO2 = 12 + (16 x 2) = 44 g/mol

Number of mols of 345 grams of CO2 = 345/44 = 7.84 mols

Number of molecules of a substance = number of mols x Avogadro's constant.

= 7.84 mol x 6.02 × 10²³ /mol

= 4.72 × 10²⁴

Hence, the number of molecules in 345 grams of carbon dioxide is 4.72 × 10²⁴ molecules.

Mekhanik [1.2K]3 years ago

6 0

You take the grams of CO₂ times Avogadro's number divided by the molar mass.

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===============

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The point is approximately at the position of the black dot in the graph.

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