How many formula units of baking soda (sodium bicarbonate) are in 2.30 tsp? (1 tsp ≈ 7.50 g NaHCO3)?
回答 (2)
2017-09-25 9:43 pm
Molar mass of NaHCO₃ = (23.0 + 1.0 + 12.0 + 16.0×3) g/mol = 84.0 g/mol
Mass of NaHCO₃ = (7.50 g) × 2.30 = 17.3 g
No. of moles of NaHCO₃ = (17.3 g) / (84.0 g/mol) = 0.206 mol
1 mole of NaHCO₃ contains 6.022 × 10²³ formula units.
No. of formula units of NaHCO₃ = (0.206 mol) × (6.022 × 10²³ formula units/mol) = 1.24 × 10²³ formula units
Mass of NaHCO₃ = (7.50 g) × 2.30 = 17.3 g
No. of moles of NaHCO₃ = (17.3 g) / (84.0 g/mol) = 0.206 mol
1 mole of NaHCO₃ contains 6.022 × 10²³ formula units.
No. of formula units of NaHCO₃ = (0.206 mol) × (6.022 × 10²³ formula units/mol) = 1.24 × 10²³ formula units
2017-09-25 9:35 pm
there are 9.500 units
收錄日期: 2021-04-18 17:50:03
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