The number of molecules in 210 grams of H₂O is 72.48 x 10²⁴.
What are moles?
The mole is a SI unit of measurement that is used to calculate the quantity of any substance. The number of models of any substance can be calculated by dividing the mass by the molar mass of the substance or compound.
Mole = mass / molar mass
Given the mass of water is 210 grams
The molar mass of water is 18.01g/mole
The mass and the molar mass will be divided.
210 / 18.01g = 11.653 mole
Now, here 1 mole is 6.22 x 10²³ molecules, so the 6.22 x 10²³ will be multiplied by the 11.653 to get the molecules of 210-gram water.
1 mole has 6.22 x 10²³ molecules
11.653 mole x 6.22 x 10²³ = 72.48 x 10²⁴
Thus, the number of molecules of H₂O is 72.48 x 10²⁴.
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