• Is chemistry hard for you?

chemists perform experiments to find out how different kinds of matter can change and
chemists perform experiments to find out how different kinds of matter can change and
10 answers · 1 day ago
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9 answers · 2 days ago
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4 answers · 3 days ago
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maybe thats why japanese are so smart because they eat a lot of fish.
maybe thats why japanese are so smart because they eat a lot of fish.
6 answers · 4 days ago
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5 answers · 3 days ago
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• Need help with chemistry calculations.?

Best answer: 1) Fe2O3 + 3 CO → 2 Fe + 3 CO2 (7.24 kg Fe2O3) / (159.6882 g Fe2O3/mol) x (2 mol Fe / 1 mol Fe2O3) = 90.677 mol Fe in theory (68.2 mol) / (90.677 mol) = 0.752 = 75.2% yield Fe 2) Na2CO3 + 2 HCl → 2 NaCl + H2O + CO2 (20.0 ml) x (0.10 M Na2CO3) x (2 mol HCl / 1 mol Na2CO3) / (0.18 M HCl) = 22.2 ml HCl 3) 3 H2... show more
Fe2O3 + 3 CO → 2 Fe + 3 CO2

(7.24 kg Fe2O3) / (159.6882 g Fe2O3/mol) x (2 mol Fe / 1 mol Fe2O3) = 90.677 mol Fe in theory

(68.2 mol) / (90.677 mol) = 0.752 = 75.2% yield Fe

2)
Na2CO3 + 2 HCl → 2 NaCl + H2O + CO2

(20.0 ml) x (0.10 M Na2CO3) x (2 mol HCl / 1 mol Na2CO3) / (0.18 M HCl) = 22.2 ml HCl

3)
3 H2 + N2 → 2 NH3

Supposing the reaction goes to completion:
120 moles of H2 would react completely with 120 x (1/3) = 40 moles of N2, but there is more N2 present than that, so N2 is in excess.
(50 mol N2 initially) - (40 mol N2 reacted) = 10 mol N2 left over
(10 mol N2) x (28.01344 g N2/mol) = 280. g N2

4)
H2SO4 + 2 NaOH → Na2SO4 + 2 H2O

(34.2 ml) x (0.320 M NaOH) x (1 mol H2SO4 / 2 mol NaOH) / (0.186 M H2SO4) = 29.4 ml H2SO4
4 answers · 4 days ago
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