Choose the correct statement relating to a chemical reaction

Chemistry

2 answers:

Snezhnost [94]3 years ago

5 0

A) the number of atoms on the reactant side equals the number of atoms on the product side

Olenka [21]3 years ago

3 0

A) the number of atoms on the reactant side equals the number of atoms on the product side

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Write a balanced chemical equation for the reaction of magnesium with hydrochloric acid (HCI (aq) to form Magnesium chloride and

ivann1987 [24]

Mg (s) + HCl (aq) → MgCl₂(s) + H₂(g)

Looking at the equation :

We have 1 Mg at the left hand side and 1 Mg as well on the right hand side.
So that is balanced.

We have 1 H at the left hand side and 2 H on the right hand side.
So that is not balanced. Same for Chlorine. Cl.

We add 2 to the HCl on the left hand side and that balances it.

Mg(s) + 2HCl(aq) → MgCl₂(s) + H₂(g)

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3 years ago

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A sample of water at 100°C is converted to steam after absorbing 820 kJ of heat. How grams of H2O are contained in the sample? A

Varvara68 [4.7K]

Since water is already at 100°C all the energy is used to evaporate it.
Now we can calculate how many mols of water are evaporated with 820kJ.
$N= \frac{820}{41} =20 mol$
We calculated that we got 20 mols of water evaporated. Now, all we have to do is find how many grams is a mol of water. Molar mass of water is 20.16 g/mol.
The final answer is:
$m=20*20.16=403.2g$

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