Question

calculate the number of molecules present in 36g of water and 16g CH4​

Answer 1

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Answer 2

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Calculate the number of molecules present in 36g of water.

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Molecular Formula of water = H2O

Molecular mass of water = 1×2 + 16 = 18g

Given mass of water = 36g

Number of moles of water =

⠀⠀⠀⠀⠀⠀⠀ Mass Given/Molecular Mass

⠀⠀⠀⠀⠀⠀⠀⠀= 36/18

⠀⠀⠀⠀⠀⠀⠀⠀= 2 mole

We know that, Number of molecules in 1 mole is equal to 6.022 × 10²³ molecules.

So, Number of molecules in 2 mole of Water

= 2 × 6.022 × 10²³

= 12.044 × 10²³

= 1.2044 × 10²⁴

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Calculate the number of molecules present in 16g of CH4.

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Molecular Formula of Methane = CH4

Molecular mass of water = 12 + 1×4 = 16g

Given mass of water = 16g

Number of moles of CH4 =

⠀⠀⠀⠀⠀Mass Given/Molecular Mass ⠀⠀⠀⠀⠀⠀= 16/16

⠀⠀⠀⠀⠀⠀= 1 mole

We know that, Number of molecules in 1 mole is equal to 6.022 × 10²³ molecules.

So, Number of molecules in 1 mole of CH4

= 6.022 × 10²³