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sleet_krkn [62]
4 years ago
11

Which compound in this chemical equation indicates that the reaction is a precipitation reaction? 2NaOH(aq) + MgCl2(aq) → 2NaCl(

aq) + Mg(OH)2(s) A. NaOH B. MgCl2 C. NaCl D. Mg(OH)2
Chemistry
2 answers:
diamong [38]4 years ago
8 0

Mg(OH)^2 because it is followed by (s) , meaning solid. Mg(OH)2 is precipitated from the solution.

The answer is D.

photoshop1234 [79]4 years ago
5 0

The correct answer is D. Mg(OH)₂. Precipitation reactions form products of which one is a precipitate denoted as (s) in the state symbols which means that it is in solid form, while the other products and reactants remain in solution or liquid form. In this reaction there is only one solid product and that is magnesium Hydroxide.

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The volume of 6.40 grams of O₂ gas at STP is 4.48L (option A). Details about volume can be found below.

<h3>How to calculate volume?</h3>

The volume of a gas can be calculated using the following formula:

p = m/v

Where;

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According to this question, the mass of O₂ gas at STP is 6.40 grams. The density of the gas at STP is 1.43 g/L.

1.43g/L = 6.4g/V

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Learn more about volume at: brainly.com/question/1578538

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Numa máquina térmica uma parte da energia térmica fornecida ao sistema(Q1) é transformada em trabalho mecânico (τ) e o restante (Q2) é dissipado, perdido para o ambiente.



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τ: trabalho realizado (J) [Joule]
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temos: τ = Q1 - Q2

O rendimento (η) é a razão do trabalho realizado pela energia fornecida:

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Uma máquina térmica cíclica recebe 5000 J de calor de uma fonte quente e realiza trabalho de 3500 J. Calcule o rendimento dessa máquina térmica.

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τ = Q1 - Q2
Q2 = Q1- τ

Q2=5000-3500
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