The number of water molecules in 50 g of water (expressed in terms of Avogadro's number) is

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The molar mass of water (H2O) is approximately 18 g/mol. Therefore, 50 g of water is equivalent to 50 g / 18 g/mol = 2.78 moles of water. Since Avogadro's number (approximately $6.022 \times 10^{23}$) represents the number of particles in one mole of a substance, 2.78 moles of water contain $2.78 \times 6.022 \times 10^{23}$ water molecules, which is approximately $2.8 \times 10^{24}$ water molecules, matching the format of the options provided.

The Number of Water Molecules in 50 G of Water