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Reaction Reading by Elementary Entities (Formula Units) Reading by Mole (NA of elementary entities or formula units)
2 H2 + O2 → 2 H2O 2 molecules of hydrogen react with 1 molecule of oxygen to form 2 molecules of water 2 moles of hydrogen react with 1 mole

of oxygen to form 2 moles of water

CH4 + 2 O2 → CO2 + 2 H2O 1 molecule of methane reacts with 2 molecules of oxygen to form 1 molecule of carbon dioxide and 2 molecules of water 1 mole of methane reacts with 2 moles of oxygen to form 1 mole of carbon dioxide and 2 moles of water
2 Na + 2 H2O → 2 NaOH + H2 2 atoms of sodium react with 2 molecules of water to form 2 formula units of sodium hydroxide and 1 molecule of hydrogen 2 moles of sodium reacts with 2 moles of water to form 2 moles of sodium hydroxide and 1 mole of hydrogen
Ca + 2 H2O → Ca(OH)2 + H2 1 atom of calcium reacts with 2 molecules of water to form 1 formula unit of calcium hydroxide and 1 molecule of hydrogen 1 mole of calcium reacts with 2 moles of water to form 1 mole of calcium hydroxide and 1 mole of hydrogen
2 NaBr + Cl2 → 2 NaCl + Br2 2 formula units of sodium bromide react with 1 molecule of chlorine to form 2 formula units of sodium chloride and 1 molecule of bromine 2 moles of sodium bromide react with 1 mole of chlorine to form 2 moles of sodium chloride and 1 mole of bromine
AgNO3 + KCl → AgCl↓ + KNO3 1 formula unit of silver nitrate reacts with 1 formula unit of potassium chloride to form 1 formula unit of silver chloride (precipitate) and 1 formula unit of potassium nitrate 1 mole of silver nitrate reacts with 1 mole of potassium chloride to form 1 mole of silver chloride (precipitate) and 1 mole of potassium nitrate
2AgNO3 +CaBr2→2 AgBr↓+ Ca(NO3)2 2 formula units of silver nitrate react with 1 formula unit of calcium bromide to form 2 formula units of silver bromide (precipitate) and 1 formula unit of calcium nitrate 2 moles of silver nitrate react with 1 mole of calcium bromide to form 2 moles of silver bromide (precipitate) and 1 mole of calcium nitrate
Na2CO3 + 2HCl→2NaCl + CO2↑ +H2O 1 formula unit of sodium carbonate reacts with 2 formula units of hydrochloric acid to form 2 formula units of sodium chloride, 1 molecule of carbon dioxide (gas), and 1 molecule of water 1 mole of sodium carbonate reacts with 2 moles of hydrochloric acid to form 2 moles of sodium chloride, 1 mole of carbon dioxide (gas), and 1 mole of water

 

Reaction Reading by Mole (NA of elementary entities or formula units) Reading by Mass (Molar mass of each substance is needed)
2 H2 + O2 → 2 H2O 2 moles of hydrogen react with 1 mole of oxygen to form 2 moles of water 4 g of hydrogen react with 32 g of oxygen to form 36 g of water
CH4 + 2 O2 → CO2 + 2 H2O 1 mole of methane reacts with 2 moles of oxygen to form 1 mole of carbon dioxide and 2 moles of water 16 g of methane react with 32 g of oxygen to form 44 g of carbon dioxide and 36 g of water
2 Na + 2 H2O → 2 NaOH + H2 2 moles of sodium reacts with 2 moles of water to form 2 moles of sodium hydroxide and 1 mole of hydrogen 46 g of sodium react with 36 g of water to form

80 g of sodium hydroxide and 2 g of hydrogen

Ca + 2 H2O → Ca(OH)2 + H2 1 mole of calcium reacts with 2 moles of water to form 1 mole of calcium hydroxide and 1 mole of hydrogen 40 g of calcium react with 36 g of water to form

74 g of calcium hydroxide and 2 g of hydrogen

2 NaBr + Cl2 → 2 NaCl + Br2 2 moles of sodium bromide react with 1 mole of chlorine to form 2 moles of sodium chloride and 1 mole of bromine 206 g of sodium bromide react with 71 g of chlorine to form 117 g of sodium chloride and 160 g of bromine
AgNO3 + KCl → AgCl↓ + KNO3 1 mole of silver nitrate reacts with 1 mole of potassium chloride to form 1 mole of silver chloride (precipitate) and 1 mole of potassium nitrate 170 g of silver nitrate react with 74 g of potassium chloride to form 143 g of silver chloride (precipitate) and 101 g of potassium nitrate
2AgNO3 +CaBr2→2 AgBr↓+ Ca(NO3)2 2 moles of silver nitrate react with 1 mole of calcium bromide to form 2 moles of silver bromide (precipitate) and 1 mole of calcium nitrate 240 g of silver nitrate react with 200 g of calcium bromide to form 356 g of silver bromide (precipitate) and 184 of calcium nitrate
Na2CO3 + 2HCl→2NaCl + CO2↑ +H2O 1 mole of sodium carbonate reacts with 2 moles of hydrochloric acid to form 2 moles of sodium chloride, 1 mole of carbon dioxide (gas), and 1 mole of water 106 g of sodium carbonate reacts with 73 g of hydrochloric acid to form 117 g of sodium chloride, 44 g of carbon dioxide (gas), and 18 g of water

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