A sample of water is known to contain 1.51 × 10^24 H2O molecules. How many moles of H2O molecules are present in the sample?
1 mol contains 6.02E23 so there are
1.51E24/6.02E23 = ? mols H2O.
To find the number of moles of H2O molecules in the given sample, you need to use Avogadro's number, which states that 1 mole of any substance contains 6.022 × 10^23 particles (atoms, molecules, etc.).
To calculate the number of moles, you can use the formula:
moles = number of particles / Avogadro's number
Given that the sample contains 1.51 × 10^24 H2O molecules, you can plug in the values into the formula to calculate the number of moles:
moles = 1.51 × 10^24 / 6.022 × 10^23
Now, divide the numerator by the denominator:
moles ≈ 2.51
Therefore, approximately 2.51 moles of H2O molecules are present in the given sample.