Chemistry, 08.07.2019 03:40 mccdp55

Calculate the work of expansion accompanying the complete combustion of 1.0 g of glucose to carbon dioxide and (a) liquid water, (b) water vapor at 20oc when the external pressure is 1 atm.

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Answer from: svaskeacevilles5477

The chemical equation for this is:
C6H12O6 + O2 --> H2O + CO2

By balancing the reaction, we get:
C6H12O6 + 6O2 --> 6H2O + 6CO2

By doing an overall energy balance, we can see that the work expansion is simply equivalent to the heat released.

To get the heat released, we use enthalpies of formations for the different substances:

HF(glucose) = -1250 kJ/kmol
HF(liquid water) = -285.83 kJ/mol
HF(water vapour) = -241.82 kJ/mol
HF(carbon dioxide) = -393.52 kJ/mol
HF(oxygen) = 0

For a) liquid water

H(Total) = (HF glucose) – 6 (HF liquid water) – 6 (HF carbon dioxide)

H(Total) = -2826.1 kJ/mol = Work

For b) water vapour

H(Total) = - (HFglucose) + 6 (HFwater vapour) + 6 (HFcarbon dioxide)

H(Total) = -2562.04 kJ/mol.

However this is still in per mole basis, so calculate number of moles of glucose supplied:
molar mass = 180.16 g/mol
moles glucose = 1g / 180.16 g/mol = .000555 mol

a) Work = -2826.1 kJ/mol * 0.000555 = -1.568 kJ
b) Work = -2562.04 kJ/mol * 0.000555 = -1.42 kJ

Answer from: Quest

- calcium has greater affinity to bond with electron receptors than hydrogen does and hence, it has the ability to replace hydrogen in most of its compounds.

- lithium has 2 valence electrons in the product because it can make only 1 bond with hydrogen. beryllium has 4 valence electrons in the product because it can only make 2 bonds. it has fewer electrons than neon and can react with electron donors. each hydrogen has 2 valence electrons, the same as helium.

- the covalent bond formed between carbon and hydrogen is polar because carbon is more electronegative than hydrogen and it attracts the bonded electron pair closer to itself, thus giving hydrogen a partial positive charge.

- a hydrogen bond is a relatively weak bond that hydrogen atoms make with the electronegative atoms nitrogen, oxygen or fluorine.

so the best choice is a.) 2 calcium (ca) atoms

Answer from: Quest

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