As a rock falls, some of its potential energy is transformed into kinetic energy. What is true about the mechanical energy durin
1 answer:
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Answer:
191.11 grams of oxygen gas should be produced.
Explanation:
The balanced reaction is:
2 Al₂O₃ → 4 Al + 3 O₂
By stoichiometry of the reaction (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
- Al₂O₃: 2 moles
- Al: 4 moles
- O₂: 3 moles
Being the molar mass of each compound:
- Al₂O₃: 102 g/mole
- Al: 27 g/mole
- O₂: 32 g/mole
By reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
- Al₂O₃: 2 moles* 102 g/mole= 204 grams
- Al: 4 moles* 27 g/mole= 108 grams
- O₂: 3 moles* 32 g/mole= 96 grams
Then you can apply the following rule of three: if by stoichiometry 108 grams of aluminum are produced along with 96 grams of oxygen, 215 grams of aluminum are produced along with how much mass of oxygen?
mass of oxygen= 191.11 grams
<u><em>191.11 grams of oxygen gas should be produced.</em></u>
Answer:
The correct answer is option d.
Explanation:
..[1]
..[2]
moles of sodium thiosulfate solution = n
Molarity of the sodium thiosulfate solution = 0.150 M
Volume of sodium thiosulfate solution used = 0.890 mL = 0.00089 L
According to reaction [2], 2 moles of sodium thiosulfate reacts with 1 mol .
Then , 0.0001335 mol of sodium thiosulfate will reacts with:
of
Moles of = 0.00006675 mol
According to reaction [1], 1 mol of is obatnied from 1 mol of NaClO.
Then 0.00006675 mol of will be obtained from:
Mass of 0.00006675 mol of NaClO=
0.00006675 mol × 74.44 g/mol = 0.00496887 g
Mass of sample = 0.0854 g
Percentage of NaClO in sample: