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laiz [17]
3 years ago
15

Which of the following are considered pure substances?

Chemistry
1 answer:
Helen [10]3 years ago
8 0
B.Elements

Explanation: they cannot be separated
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Solid added to liquid and the solid floats down to bottom of container physical or chemical change?
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Physical change

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What is the relationship between the location of volcanoes and earthquakes?
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8 0
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Read 2 more answers
Butane (C4 H10(g), Delta. Hf = â€"125. 6 kJ/mol) reacts with oxygen to produce carbon dioxide (CO2 , Delta. Hf = â€"393. 5 kJ/mo
Anton [14]

The enthalpy of this reaction is -5315 KJ/mol.

The equation of the reaction is;

2C4H10(g) + 13O2(g) -----> 8CO2 (g) + 10H2O(g)

We know that the enthalpy of reaction can be obtained from the enthalpy of formation of the reactants and products as follows;

ΔHrxn = ΔHf(products) - ΔHf(reactants)

We have the following information from the question;

ΔHf C4H10 = - 125. 6 kJ/mol

ΔHf CO2 = - 393. 5 kJ/mol

ΔHf H2O = - 241. 82 kJ/mol

ΔHf O2 = 0 KJ/mol

Hence;

[(8 × (- 393. 5 )) + (10 × (-  241. 82))] - [2( - 125. 6))]

= -5315 KJ/mol

Learn more: brainly.com/question/13164491

5 0
1 year ago
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