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Questions and Answers
What is the oxidation number of nitrogen in the compound ammonium chloride?
What is the oxidation number of nitrogen in the compound ammonium chloride?
-1
How many moles are in 252 g of gold (Au)? Do not include units in the blank.
How many moles are in 252 g of gold (Au)? Do not include units in the blank.
1.28
8.461 x 10^24 atoms of calcium is equal to ________ moles of calcium.
8.461 x 10^24 atoms of calcium is equal to ________ moles of calcium.
14.05
What is the molar mass of water? Do not include units in the blank.
What is the molar mass of water? Do not include units in the blank.
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How many moles are in 100.0 g of water? Do not include units in the blank.
How many moles are in 100.0 g of water? Do not include units in the blank.
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Study Notes
Oxidation Number and Atomic Masses
- Nitrogen in ammonium chloride has an oxidation number of -3.
- Xenon (Xe) has an average atomic mass of 131.293 u.
- The molar mass of xenon is 131.293 g/mol, indicating the mass of one mole.
Moles of Gold
- A sample weighing 252 g of gold (Au) contains approximately 1.28 moles.
Moles of Calcium
- The number of atoms in 8.461 x 10²⁴ of calcium equals approximately 14.05 moles.
Molar Mass of Water
- The molar mass of water (H₂O) is 18.0153 g/mol, a crucial figure for stoichiometric calculations.
Moles of Water
- A mass of 100.0 g of water corresponds to about 5.55 moles.
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