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stiv31 [10]
3 years ago
10

A sample of a substance containing only magnesium and chlorine was tested in the lab and was found to be composed of 74.5% chlor

ine by mass. If the total mass of the sample was 190.2 grams, what was the mass of the magnesium?
A) 24.3 g B) 48.5 g
C) 70.9 g D) 142 g
I know the answer is B, but I don't understand why.....
Chemistry
1 answer:
chubhunter [2.5K]3 years ago
8 0
Use a ratio to find out that x/190.2 = 74.5/100 

hope this helps
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Answer:

C₄H₈ + Br₂ → C₄H₈Br₂

Explanation:

To balance a chemical equation, you need to ensure that the number of each element in the reactant side, matches the number of each element on the product side.

 Reactants                   Product

C₄H₈ + Br₂         →          C₄H₈Br₂

C = 4                                 C= 4

H = 8                                 H= 8

Br = 2                                Br = 2

Since they match up on both sides, the chemical equation is balanced, so we keep it as is.

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4vir4ik [10]

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7 0
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deff fn [24]

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exponent indicates which way the decimal moved and to how many places

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