Answer: 151 kJ
Explanation:
To calculate the moles :
It is given that:
0.267 moles of 
absorb energy = 40.3 kJ
Thus 1 mole of absorb energy =
Thus the value of 
for the chemical equation given is 151 kJ
Express the oxidation state numerically (e.g., +1).
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Ions
In an ion, the sum of the oxidation states is equal to the overall ionic charge. Note that the sign of the oxidation states and the number of atoms associated with each oxidation state must be considered. In OH−, for example, the oxygen atom has an oxidation state of −2 and the hydrogen atom has an oxidation state of +1, for a total of (−2)+(+1)=−1.
Part C
What is the oxidation state of an individual phosphorus atom in PO33−?
Express the oxidation state numerically (e.g., +1).
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Part D
What is the oxidation state of each individual carbon atom in C2O42−?
Express the oxidation state numerically (e.g., +1).
First we will write the formula for the combustion of the sugar.
C₁₂H₂₂O₁₁ + 12O₂ → 12CO₂ + 11H₂O
We have produced 2.40 g of CO₂. We will convert this to moles of CO₂ and then convert that value to moles of sugar.
2.40 g / 44.0 g/mol = 0.0545 moles CO₂ x 1 mole C₁₂H₂₂O₁₁/12 mole CO₂ = 0.00455 moles of C₁₂H₂₂O₁₁
We can now convert the moles of sugar to a mass of sugar.
0.00455 moles C₁₂H₂₂O₁₁ x 342 g/mol = 1.56 g C₁₂H₂₂O₁₁
We want to determine the mass percentage of salt in the 3.5 g mixture of sugar and salt.
3.5 g mixture - 1.56 g sugar = 1.94 g salt
(1.94 g salt/ 3.5g mixture) x 100% = 55%
Therefore, the mass percentage of table salt in the mixture is 55%.
For the constituents of a mixture, they retain their individual properties meaning iron remains magnetic and sulfur remains a non metal and non metallic.
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Answer:
B, C, A
Mechanical energy is b, then c, a
