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3 years ago

15

Which formula equation shows a reversible reaction?

2 answers:

timurjin [86]3 years ago

8 0

The question is incomplete, here is the complete question:

Which formula equation shows a reversible reaction?

A: $2Na+F_2\rightarrow 2NaF$

B: $CaCO_3\rightarrow CaO+CO_2$

C: $NH_4Cl(s)\rightleftharpoons 2NH_3(g)+HCl(g)$

D: $2H_2O_2(aq.)+Pt\rightarrow 2H_2O(l)+O_2(g)$

<u>Answer:</u> The reversible reaction is $NH_4Cl(s)\rightleftharpoons 2NH_3(g)+HCl(g)$

<u>Explanation:</u>

Reversible reaction is defined as the reaction in which the products formed react together to give the reactants back. For general reversible chemical equation:

$A+B\rightleftharpoons C+D$

Irreversible reaction is defined as the reaction in which the reactants only lead to products and the reaction do not proceed back. For general irreversible chemical reaction:

$A+B\rightarrow C+D$

For the given options:

The reaction having an equilibrium sign between the reactants and products is equation C.

Hence, the reversible reaction is $NH_4Cl(s)\rightleftharpoons 2NH_3(g)+HCl(g)$

pishuonlain [190]3 years ago

3 0

Answer:2NaF is the correct one. It’s a simple combination and can be be split with relative ease

Explanation:

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Answer:

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How many moles are in 2.0 grams of Na?

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Answer:

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How many moles of KOH are required to produce 4.79 g K3PO4 according to the following reaction? 3KOH + H3PO4 -----> K3PO4 + 3

8_murik_8 [283]

Answer:

0.677 moles

Explanation:

Take the atomic mass of K = 39.1, O =16.0, P = 31.0

no. of moles = mass / molar mass

no. of moles of K3PO4 used = 4.79 / (39.1x3 + 31 + 16x4)

= 0.02256 mol

From the equation, the mole ratio of KOH : K3PO4 = 3 :1,

meaning every 3 moles of KOH used, produces 1 mole of K3PO4.

So, using this ratio, let the no. of moles of KOH required to be y.

$\frac{3}{1} =\frac{y}{0.02256} \\$

y = 0.02256 x3

y = 0.0677 mol

If you don't find exactly 0.677 moles as one of the options, go for the closest one. A very slight error may occur because of taking different significant figures of atomic masses when calculating.

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Weak bonds require less energy to form than strong bonds

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As a result, for a greater bond length, the attraction force is lower than for a shorter bond length. This implies that large atoms would form weak bonds and small atoms would form strong bonds.

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