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Hi there.
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In this question, we are given information about one substance in a reaction.
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In fact, one of the reactants, and we want to know how much of one of the products are going to be produced.
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That means this is a stoichiometry problem.
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So for any stoichiometry problem, the first thing we need is a balanced equation.
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So in this reaction, we are told that we have methane gas, which is ch4, and that is a gas.
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It's reacting with chlorine gas.
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Is a diatomic, meaning that as a pure element, it exists as two chlorine atoms bonded together.
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And we are told that this produces hydrogen chloride gas, which is hcl, plus carbon tetrachloride.
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So carbon and four chlorines.
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Okay, so we have written the correct formulas for each of the reactants.
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Now we need to balance, and products, and now we need to balance this.
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So starting with the carbon, we see there's one carbon on each side.
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Next, the hydrogen.
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There are four hydrogen on the reactant side, but only one on the product side.
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So we need a four in front of hcl.
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On the product side, then, this gives us four chlorine in the hcl, and four more chlorine in the ccl4, for a total of eight chlorine.
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That means on the reactant side, we also need a four in front of cl2 to give us eight chlorine.
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All right, so we have a balanced equation.
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And a balanced equation gives us the mole ratio in an equation.
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In other words, the coefficients tell us the mole ratio of the reactants reacting and the products being formed.
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So there is nothing written in front of ch4, so that's understood that the coefficient is one.
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So for every one mole of ch4, four moles of chlorine will react, will produce four moles of the hydrogen chloride gas, and one mole of the ccl4...