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ANEK [815]
3 years ago
11

Gaseous hydrogen and oxygen can be prepared in the laboratory from the decomposition of gaseous water. The equation for the reac

tion is2H2O(g) --> 2H2(g)+O2(g)Calculate how many grams of O2(g) can be produced from 42.6 grams of H2O(g).
Chemistry
2 answers:
monitta3 years ago
4 0

Answer:

  • 75.5 g O₂ (g) can be produced from 42.6 g of H₂O (g)

Explanation:

<u>1) Balanced chemical equation (given):</u>

  • 2H₂O(g) → 2H₂(g) + O₂(g)

<u>2) Mole ratios:</u>

  • 2 moles H₂O(g) : 2 moles H₂(g) : 2 moles O₂(g)

<u>3) Calculate the number of moles of reactant (H₂0):</u>

  • number of moles = mass in grams / molar mass

  • molar mass of water: 18.015 g/mol

  • mass in grams of water: 42.6 g

  • number of moles = 42.6 g / 18.05 g/mol = 2.36 moles H₂O

<u>4) Set a proportion using the mole ratio  O₂ to H₂O and the actual number of moles of H₂O:</u>

  • 2 moles O₂ / 2 moles H₂O = x / 2.36 moles H₂O

  • x = 2.36 moles O₂

<u>5) Convert 2.36 moles O₂ to grams:</u>

  • mass in grams = number of moles × molar mass

  • mass = 2.36 moles × 32.00 g/mol = 75.5 g O₂
maw [93]3 years ago
4 0

Answer:

37.87 g of oxygen can be produced from the 42.6 grams of H2O

Explanation:

From the question, the following equation shows the decomposition of gaseous water

2H₂O(g) ⇒ 2H₂(g) + O₂(g)

where atomic mass of hydrogen is 1 g/mol and atomic mass of oxygen is 16 g/mol

The molar mass of 2H₂O is;

2[(2 ×1) + (16 × 1)]

2(2+16) =  <u>36 g</u>

The molar mass of O₂ is;

2 × 16 = <u>32 g</u>

Hence, it can be deduced that 36 g of water produced 32 g of oxygen, hence 42.6g of water will produce how many grams of oxygen (represented as X)

∴ 36 ⇒ 32

42.6 ⇒ X

X = 42.6 × 32/36

X = 37.87 g

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Answer:

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8 0
1 year ago
MnO2 + 4HCl reacts to form MnCl2 + CL2 + 2H2O If .86 mol of MnO2 and 48.2 g of HCl react, which reactant is the limiting reagent
Katen [24]
HCl:
<span>
m=48,2g
M=36,5g/mol

n = m/M = 48,2g / 36,5g/mol = 1,32mol

1mol          : 4mol
MnO</span>₂        + 4HCl ⇒ MnCl₂ + Cl₂ + 2H₂O
0,86mol     :  1,32mol
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6 0
2 years ago
29. What is E for a system which has the following two steps:
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Answer:

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Explanation:

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When heat is absorbed by the system q is positive

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When work is done on the system w is positive

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Answer:

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