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1.How many miles of water does a raindrop contain if it has a mass of 0.060g?

2.What mass of water would you need to have 15 moles of H20?

3.A container of Trader Joe’s sea salt contains 750 grams.How many miles of sodium chloride (NaCl) is this?

4. A cake recipe calls for 0.080 moles of baking soda (NAHCO3).What mass should the chef measure out?

5. The chemical formula for rust is Fe203. If the total mass of rust on a 1967 Chevy corvette is 190 kg, how many moles is that?

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Answer:

1. 0.0033 moles of water.

2. 270g of water

3. 12.8g NaCl

4. 6.72g NaHCO3

5. 1190moles Fe2O3

Explanation:

To convert moles to grams or vice versa we require tu use molar mass of the substance as follows:

1. Molar mass water: 18g/mol

0.060g * (1mol / 18g) = 0.0033 moles of water

2. Molar mass water: 18g/mol

15 moles H₂O * (18g / 1mol) = 270g of water

3. We can assume all sea salt is NaCl -Molar mass: 58.44g/mol-

750g NaCl * (1mol / 58.44g) = 12.8g of NaCl

4. Molar mass NaHCO₃: 84g/mol:

0.080mol * (84g/mol) = 6.72g NaHCO3

5. Molar mass Fe2O3: 159.69g/mol:

190kg = 190000g * (1mol / 159.69g) = 1190moles Fe2O3

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