1. You have 3.0times 10^24 molecules of water (H_(2)O) . What is the mass of this sample in grams?

To find the mass of the sample, we need to use the molar mass of water and's number information:- Number of molecules of water: Step 1: Calculate the number of moles of water.Number Number of molecules / Avogadro's numberNumber of moles = molecules / molecules/molNumber of moles = 5.0 molStep 2: Calculate the mass of the sample.Mass = Number of moles × Molar mass of waterMolar mass of water = 18.01528 g/molMass = 5.0 mol × 18.01528 g/molMass = 90.0764 gTherefore, the mass of the sample is 90.08 grams