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Elena-2011 [213]
3 years ago
8

Based on the reaction, identify the products.

Chemistry
2 answers:
solong [7]3 years ago
8 0

The product is Be and it is a replacement reaction.

igomit [66]3 years ago
3 0

Answer:

The reactants are MgF₂ and Be.

This is a single displacement reaction.

Explanation:

Chemical reactions are written like this:

reactant + reactant  =>  product + product

There may be more or less reactants and products on each side, separated by + the plus sign. The reactants are on the left and the products are on the right.

In the equation BeF₂ + Mg  =>  MgF₂ + Be, <u>the products (on the right side) are MgF₂ and Be</u>.

Since the total reactants are equal to the total products, every element that you see on the left must also appear on the right. On the left, the question gave you the elements "Be", "F" and "Mg". On the right, "Be" was missing, so it must be the missing product.

This is a <u>single displacement reaction</u> because one element that was in a pair was replaced by another.

All single displacement reactions look like this:

AB + C = AC + B          An element that was paired up switched places with another element that was not paired up.

In this reaction, "Be" was displaced. It started the reaction paired up with "F", but it was replaced by "Mg".

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Answer:

0.4694 moles of CrCl₃

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The balanced equation is:

Cr₂O₃(s) + 3CCl₄(l) → 2CrCl₃(s) + 3COCl₂(aq)

The stoichiometry of the equation is how much moles of the substances must react to form the products, and it's represented by the coefficients of the balanced equation. So, 1 mol of Cr₂O₃ must react with 3 moles of CCl₄ to form 2 moles of CrCl₃ and 3 moles of COCl₂.

The stoichiometry calculus must be on a moles basis. The compounds of interest are Cr₂O₃ and CrCl₃. The molar masses of the elements are:

MCr = 52 g/mol

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So, the molar mass of the Cr₂O₃ is = 2x52 + 3x35.5 = 210.5 g/mol.

The number of moles is the mass divided by the molar mass, so:

n = 49.4/210.5 = 0.2347 mol of Cr₂O₃.

For the stoichiometry:

1 mol of Cr₂O₃ ------------------- 2 moles of CrCl₃

0.2347 mol of Cr₂O₃----------- x

By a simple direct three rule:

x = 0.4694 moles of CrCl₃

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