Answer:
Explanation:
These numbers are all approximate. You will have to consult your text to get exact numbers.
density = mass (grams)/ volume(mL)
density of water = 1 gram / 1 mL
given volume = 30 mL
mass = ?
density = mass / volume
1 = mass / 30 mL
mass = 1 * 30 mL = 30 grams
1 mol of water = 18.02 grams (2 * 1.01 + 16)
x mol of water = 30 grams
18.02 * x = 1 * 30
x = 30/18.02
x = 1.66 mol
Note this is the answer to the question that asks how many mols are in 30 mL of water.
1 mol of anything is 6.02 * 10^23 parts
1.66 mol = x
1*x = 1.66 * 6.02*10^23
x = 1.0022 * 10^24 particles
Answer: there are 1.0022*10^24 molecules of water in 30 mL of water
