A sample of substance X that has a mass of 326. 0 g releases 4325. 8 cal when it freezes at its freezing point. If substance X h
1 answer:
The molar heat of fusion of X has been 775.6 cal/mol. Thus, option C is correct.
The molar heat of fusion has been defined as the energy absorbed or released by a mole of substance in converting between solid and liquid state.
<h3>Computation for the molar heat of fusion</h3>The given mass of substance X has been, 326 g.
The molar mass of substance X has been 58.45 g/mol.
The moles of sample have been given as:
Thus, the amount of heat absorbed by 5.58 mol of sample has been 4325.8 cal.
The amount of heat absorbed by a mole of sample has been:
The amount of heat absorbed by a mole of sample in meting has been the molar heat of fusion.
Thus, the molar heat of fusion of X has been 775.6 cal/mol. Thus, option C is correct.
Learn more about heat of fusion, here:
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Answer:
223.4 grams of iron can be produced from 2.5 moles of Fe2O3 and 6.0 moles of CO.
Explanation:
The balanced reaction is:
Fe₂O₃ (s) + 3 CO(g) → 2 Fe(s) + 3 CO₂ (g)
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of reactant and product participate in the reaction:
- Fe₂O₃: 1 mole
- CO: 3 moles
- Fe: 2 moles
- CO₂: 3 moles
Being:
- Fe: 55.85 g/mole
- O: 16 g/mole
- C: 12 g/mole
the molar mass of the compounds participating in the reaction is:
- Fe₂O₃: 2*55.85 g/mole + 3*16 g/mole= 159.7 g/mole
- CO: 12 g/mole + 16 g/mole= 28 g/mole
- Fe: 55.85 g/mole
- CO₂: 12 g/mole + 2*16 g/mole= 44 g/mole
Then, by stoichiometry of the reaction, the following quantities participate in the reaction:
- Fe₂O₃: 1 mole* 159.7 g/mole= 159.7 g
- CO: 3 moles* 28 g/mole= 84 g
- Fe: 2 moles* 55.85 g/mole= 111.7 g
- CO₂: 3 moles* 44 g/mole= 132 g
The limiting reagent is one that is consumed first in its entirety, determining the amount of product in the reaction. When the limiting reagent is finished, the chemical reaction will stop.
So, first of all, you can apply the following rule of three: if by reaction stoichiometry 1 mole of Fe₂O₃ reacts with 3 moles of CO, then 2.5 moles of Fe₂O₃ react with how many moles of CO?
moles of CO= 7.5
But 7.5 moles of CO are not available, 6.0 moles are available. Since you have less moles than you need to react with 2.5 moles of Fe₂O₃, CO will be the limiting reagent.
Now you can apply the following rule of three: if by reaction stoichiometry 3 moles of CO produce with 111.7 grams of Fe, then 6 moles of CO will produce how much mass of Fe?
mass of Fe= 223.4 grams
<u><em>223.4 grams of iron can be produced from 2.5 moles of Fe2O3 and 6.0 moles of CO.</em></u>
<h2>Input = 
, water and Output = 
</h2>
Explanation:
The light reactions of photosynthesis use water and produce Oxygen, NADPH.
The equation for photosynthesis :
→
The process of photosynthesis in two stages -
- The first stage is called the light reaction in which the light energy from the sun is captured and converted into chemical energy stored in the form of ATP and NADPH
- The second stage is the process of conversion of ATP molecules to sugar or glucose (the Calvin Cycle)
For a light reaction -
Net Input is of, ,
Net Output is of,