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PLEASE HELP ME WITH THESE CHEMISTRY QUESTIONS!!?
How many copper atoms are in a pure copper statue with a mass of 200
kg?
Calculate the mass in grams of a single water molecule.
Express your answer using four significant figures.
How many grams are in 3.60
mol of sodium chloride (NaCl)?
Express your answer numerically in grams.
How many water molecules are in a block of ice containing 0.500
mol
of water (
H
2
O
)?
Express the number of molecules numerically.
1 Answer
- ArgentLv 74 years agoFavorite Answer
1. Use the molar mass of copper: 63.546 g/mol. Divide this into the mass of the statue to get the number of moles; multiply this by the Avogadro constant to get the number of atoms.
2. Use the masses of the total number of protons (8+1+1) and neutrons (8+1+1). (Ignore the electrons' masses as being too small to matter.) Convert these sums to grams (since they're given in kilograms in the Wikipedia articles linked below).
3. Use the molar mass of NaCl; multiply this by the given number of moles.
4. Multiply the given number of moles by the Avogadro constant.
Source(s): https://en.wikipedia.org/wiki/Copper https://en.wikipedia.org/wiki/Avogadro_constant https://en.wikipedia.org/wiki/Proton https://en.wikipedia.org/wiki/Neutron https://en.wikipedia.org/wiki/Sodium_chloride