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vaieri [72.5K]
2 years ago
11

Choose all the answers that apply. Which of the following are essential elements are the most abundant on earth and are essentia

l for life on Earth to exist? hydrogen sodium carbon chloride oxygen help fast
Chemistry
1 answer:
Lynna [10]2 years ago
8 0

Answer:

you answers are sodium and chloride oxygen

Explanation:

sodium

chloride oxygen

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What is the standard heat of reaction for the following reaction?
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Answer:

The correct answer to the question is

The standard heat of reaction for the reaction is

a. 216.8 kJ released per mole

Explanation:

The heat of reaction is given by [Heat of formation of products] - [Heat of formation of reactants]

In the question we have, heat of formation of the products Zn+2 (aq) = -152.4 kJ/mole and the heat of formation of the reactants = 64.4 kJ/mole

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Answer:

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