Answer:
a) -7.395kJ of energy are released.
b) 125g of O₂ must react.
Explanation:
Based on the reaction:
4 Fe (s) + 3 O₂(g) → 2 Fe₂O₃ (s) ΔH = -1652 kJ
<em>4 moles of iron with an excess of oxygen release -1652kJ of energy</em>
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a) The heat released is:
1.00g Fe (molar mass: 55.845g/mol)
1.00g × (1mol / 55.845g) = 0.0179 moles de Fe.
As 4 moles release -1652kJ, 0.0179 moles release:
0.0179 mol Fe × (-1652kJ / 4mol Fe) =<em> -7.395kJ of energy are released.</em>
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b) As 3 moles of oxygen produce -1652kJ, 2150kJ are released when react:
2150kJ × (3 mol O₂ / 1652kJ) = 3.9 moles of O₂
As molar mass of O₂ is 32g/mol, mass of 3.9 moles of O₂ is:
3.9 mol O₂ × (32g / mol) = <em>125g of O₂ must react</em>.
Answer:
0.0226
Explanation:
Given data:
Mass of water = 0.406 g
Molar mass of water = 18.0 g/mol
Number of moles = ?
Solution:
Number of moles = mass/ molar mass
Number of moles = 0.406 g / 18.0 g/mol
Number of moles = 0.0226 mol
The answer with out units and three significant figures is 0.0226. In this value the significant figures are 226.
Answer:
There can be a number of chemical processes by which a compounds can be broken down into simpler substances. The most common and wide-spread of such processes is Catabolism. Along with anabolism, catabolism make up the metabolism process for living organisms.
The answer is water is a compound