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nadya68 [22]
3 years ago
10

When a current is passed through a solution of salt water, sodium chloride decomposes according to the following reaction: NaCl

+ H2O → NaOH + Cl2 + H2 Balance the equation. Choose "blank" if no coefficient is needed. NaCl + H2O → NaOH + Cl2 ++ H2
Chemistry
1 answer:
aivan3 [116]3 years ago
5 0

Answer:

The answer to your question is   2NaCl  + 2H₂O    ⇒   2NaOH  +  Cl₂  +  H₂

Explanation:

Original chemical equation

                   NaCl  +  H₂O    ⇒   NaOH  +  Cl₂  +  H₂

                   Reactant      Element        Products

                       1                    Na                    1

                       1                    Cl                      2

                       2                    H                      3

                       1                     O                      1

This reactions is unbalanced

                2NaCl  + 2H₂O    ⇒   2NaOH  +  Cl₂  +  H₂

                   Reactant      Element        Products

                      2                    Na                    1

                      2                    Cl                     2

                      4                    H                      4

                      2                     O                     2

Now, the reaction is balanced

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A sample of calcium phosphate was found to have a mass of 125.3 g. How many molecules were contained in the sample?
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The answer for the following problem is mentioned below.

  • <u><em>Therefore number of molecules(N) present in the calcium phosphate sample are  19.3 × 10^23 molecules.</em></u>

Explanation:

Given:

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We know;

molar mass of calcium phosphate  (Ca_{3}(PO_{4} )_{2} ) = (40×3) + 3 (31 +(4×16))

molar mass of calcium phosphate  (Ca_{3}(PO_{4} )_{2} ) = 120 + 3(95)

molar mass of calcium phosphate  (Ca_{3}(PO_{4} )_{2} )  = 120 +285 = 405 grams

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no of molecules present in the sample(N)

We know;

\frac{m}{M} =\frac{N} }{}N÷N_{A}

\frac{405}{125.3} =\frac{N}{6.023*10^23}

N =(405×6.023 × 10^23) ÷ 125.3

N = 19.3 × 10^23 molecules

<u><em>Therefore number of molecules(N) present in the calcium phosphate sample are  19.3 × 10^23 molecules</em></u>

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