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browndarrell085
28.10.2020 •
Chemistry
Which of the following equations follows the Law of Conservation of Mass?
(5 Points)
3H20 --> 3H2 + 3 02
C2H4 + 3 02 --> 2 CO2 + 2 H2O
C + 4H2 --> CH4
2Na + Cl --> NaCl
Plz hel
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Ответ:
28.2 g of NaOH
Explanation:
We need to calculate the grams of NaOH needed to react with 25.0 g of Cl₂ in the following reaction:
2 NaOH(aq) + Cl₂(g) → NaOCI(aq + H₂0(I) + NaCl(aq)
We are going to solve this by making use of the molar ratio between Cl₂ and NaOH given by the reaction equation where we see that every mol of Cl₂ will react with 2 moles of NaOH.
So first we need to convert the 25.0 g of Cl₂ to moles:
Molar Mass of Cl₂ = 2 x 35.45 = 70.90 g/molMoles of Cl₂ = 25.0 g / 70.90 g/mol = 0.3526 molesThen we need to calculate the moles of NaOH needed to react with these moles of Cl₂ knowing that every mol of Cl₂ will react with 2 moles of NaOH:
moles of NaOH = 2 x moles of Cl₂ = 2 x 0.3526 moles = 0.7052 molesNext we must convert these moles to grams:
Molar Mass of NaOH = 22.990 + 15.999 + 1.008 = 40.00 g/molMass of NaOH = 0.7052 moles x 40.00 g/mol = 28.2 g28.2 g are needed to react with 25.0 g of Cl₂ in the production of NaOCl