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2 years ago

How are atoms related to balancing a chemical equation?

1 answer:

3 0

Atoms are related to balancing equations because the amount of atoms on the left of the equation (reactants) needs to be the same amount on the right (products).

For example, 2H₂ + O₂ → 2H₂O

If you count the amount of hydrogen atoms on both sides each, there would be 4 (make sure to multiply the coefficient by the subscripts).

If you count the amount of oxygen atoms on both sides each, there will be 2 of them (2 in a molecule of oxygen)

I hope this helps and please mark me as brainliest!

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3 years ago

Suppose 650.mmol of electrons must be transported from one side of an electrochemical cell to another in 10.0 minutes. Calculate

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Answer:

The size of electric current must 104.5 Ampere.

Explanation:

Moles of electrons = 650 mmol = $650\times 0.001 mol$

mmol = 0.001 mol

1 mol = $N_A=6.022\times 10^{23}$ atoms/ions

Number of electrons = N

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3 years ago

0.378g grams of a compound is made up of 0.273g of Mg and 0.105g nitrogen. Find its empirical formula.

Harrizon [31]

Answer:

The empirical formula of the compound is $Mg_3N_2$ .

Explanation:

Mass of magnesium in compound = 0.273 g

Mass of nitrogen in the compound = 0.105 g

Moles of magnesium = $\frac{0.273 g}{24.305 g/mol}=0.0112 mol$

Moles of nitrogen = $\frac{0.105 g}{14.0067 g/mol}=0.00750 mol$

Form empirical formula divides the lowest value of moles of an element present with all the moles of elements present.

Magnesium $=\frac{0.0112 mol}{0.00750 mol}=1.5$

Nitrogen $=\frac{0.00750mol}{0.00750 mol}=1$

The empirical formula of a compound:

$Mg_{1.5}N_1=Mg_{\frac{15}{10}}N_1=Mg_{15}N_{10}=Mg_3N_2$

The empirical formula of the compound is $Mg_3N_2$ .

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