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## How many molecules of water are present in 75g of H2O?

Since, 1 molecule of H2O weighs = 18 amu. = **2.50958333 × 10^24 molecules** of H20. Hence, 75 g of H20 contains 2.50958333 × 10^24 molecules of H20.

## How many moles are in 72 grams of H2O?

Ans : 18 g of wateroccupies one mole and one mole contains Avagadro’s no. ofmolecules = 6.023*10^23 molecules . question says 72 g of water . 72 g of wateroccupies **4 moles**.

## How many moles of water are in H2O?

The average mass of one H2O molecule is 18.02 amu. The number of atoms is an exact number, the number of mole is an exact number; they do not affect the number of significant figures. The average mass of **one mole** of H2O is 18.02 grams. This is stated: the molar mass of water is 18.02 g/mol.

## How many water molecules are present in 25.0 grams of h2o?

Here we have 25.0 g/(18.0g/mole) = 1.39 moles water (3 sig figs). Multiply 1.39 moles times the definition of a mole to arrive at the actual number of water molecules: 1.39 (moles water) * 6.02 x 10^{23} molecules water/(mole water) = **8.36 x 10 ^{23} molecules water**.

## How many molecules of h2o are present in 3.45 g h2o?

3.50⋅mol×6.022×1023⋅mol−1≅**21×1023 individual** water molecules.

## How many moles are in 75 grams of water?

Convert the mass to moles (using molar mass). There are **4.17 mol H _{2}O** in 75 grams of water.

## How many moles of C are in 75 g of C?

75 g of C **0.25 mole** of C_2H_6 88 g of CO_2.

## How many molecules are in 50ml of water?

Answer: Avogadro’s number tells us there are **6.022 x 1023 molecules** of water per mole of water. So, next we calculate how many molecules there are in a drop of water, which we determined contains 0.002775 moles: molecules in a drop of water = (6.022 x 1023 molecules/mole) x 0.002275 moles.