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nikdorinn [45]
3 years ago
9

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

Chemistry
2 answers:
rewona [7]3 years ago
8 0

Answer:

<em>4.72 × 10²⁴</em> molecules

Explanation:

<em>Number of mols of a substance = mass of substance/molar mass of substance</em>

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

<em>Number of molecules of a substance = number of mols x Avogadro's constant.</em>

<em>                   = 7.84 mol  x 6.02 × 10²³ /mol</em>

<em>                    = 4.72 × 10²⁴</em>

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

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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Explanation:

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A rock has a density of 3.75g/cm3 and a mass of 26g. What is the volume of the rock?
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Answer:

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