What is the total mass when adding 150.0 g of H2O and 1.350 g of NaCl?

To determine the total mass when adding 150.0 g of H2O and 1.350 g of NaCl, you simply add the two masses together.

The mass of water (H2O) is 150.0 g, and the mass of sodium chloride (NaCl) is 1.350 g. When you perform the calculation:

150.0 g + 1.350 g = 151.350 g.

When rounding this value to three significant figures, the result is 151.4 g. In terms of significant figures, the figures provided in the mass of water (three significant figures) dictate how the final answer should be rounded.

Therefore, the correct choice reflects proper rounding based on the significant figures of the values used in the calculation.