1. A box of salt contains 1668 grams of sodium chloride. How many moles of sodiu
ID: 560493 • Letter: 1
Question
1. A box of salt contains 1668 grams of sodium chloride. How many moles of sodium are present? Make sure to include the correct unit symbol with the answer choice.
2. At STP, what is the mass, in grams, of 13.42 liters of O2 gas? Make sure to include the correct unit symbol with the answer choice.
3. When 4 moles of aluminium are allowed to react with an excess of chlorine gas, how many moles of aluminum chloride are produced? Which below chemical equation is needed to correctly solve how many moles of aluminum chloride are produced?
4. When acetylene, C2H2, burns in oxygen, high temperatures are produced that are used for welding metals.
2C2H2 + 5O2 4CO2 + 2H2O
How many grams of Carbon dioxide are produced when 287.9 grams of acetylene is burned?
5. At STP conditions, what is the volume, in liters, of 19.0 grams of sulfur dioxide gas? Make sure to include the correct unit symbol with the answer choice.
Explanation / Answer
1)
Molar mass of NaCl = 1*MM(Na) + 1*MM(Cl)
= 1*22.99 + 1*35.45
= 58.44 g/mol
mass of NaCl = 1668 g
we have below equation to be used:
number of mol of NaCl,
n = mass of NaCl/molar mass of NaCl
=(1668.0 g)/(58.44 g/mol)
= 28.54 mol
Answer: 28.54 mol
2)
Molar volume at STP is 22.4 L
number of mol = volume / molar volume
= 13.42 / 22.4 mol
= 0.599 mol
Answer: 0.599 mol
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