Chemistry, 26.06.2019 04:10 samsavage4073

Toluene, c6h5ch3, is oxidized by air under carefully controlled conditions to benzoic acid, c6h5co2h, which is used to prepare the food preservative sodium benzoate, c6h5co2na. what is the percent yield of a reaction that converts 1.000 kg of toluene to 1.21 kg of benzoic acid?

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Answer from: steven983

Answer : The percent yield of the reaction is, 91.32 %

Explanation : Given,

Mass of C_6H_5CH_3 = 1 Kg = 1000 g

Molar mass of C_6H_5CH_3 = 92.14 g/mole

Molar mass of C_6H_5COOH = 122.12 g/mole

First we have to calculate the moles of C_6H_5CH_3 .

$\text{Moles of }C_6H_5CH_3=\frac{\text{Mass of }C_6H_5CH_3}{\text{Molar mass of }C_6H_5CH_3}=\frac{1000g}{92.14g/mole}=10.85mole$

Now we have to calculate the moles of C_6H_5COOH .

The balanced chemical reaction will be,

$2C_6H_5CH_3+3O_2\rightarrow 2C_6H_5COOH+2H_2O$

From the balanced reaction, we conclude that

As, 2 moles of C_6H_5CH_3 react to give 2 moles of C_6H_5COOH

So, 10.85 moles of C_6H_5CH_3 react to give 10.85 moles of C_6H_5COOH

Now we have to calculate the mass of C_6H_5COOH

$\text{Mass of }C_6H_5COOH=\text{Moles of }C_6H_5COOH\times \text{Molar mass of }C_6H_5COOH$

$\text{Mass of }C_6H_5COOH=(10.85mole)\times (122.12g/mole)=1325.002g$

The theoretical yield of C_6H_5COOH = 1325.002 g

The actual yield of C_6H_5COOH = 1.21 Kg = 1210 g

Now we have to calculate the percent yield of C_6H_5COOH

$\%\text{ yield of }C_6H_5COOH=\frac{\text{Actual yield of }C_6H_5COOH}{\text{Theoretical yield of }C_6H_5COOH}\times 100=\frac{1210g}{1325.002g}\times 100=91.32\%$

Therefore, the percent yield of the reaction is, 91.32 %

Answer from: Quest

Yes it would be a physical change.

Answer from: Quest

The answer to your question really depends on three things: how much water you have, how cold it is to start out, and how cold the things around it are. water actually freezes when it gets to 32 degrees fahrenheit (0 degrees celsius), but the time it takes to get there may be different. let's start with the first. if you take two glasses, and fill one with a tiny bit of water, and the other about halfway, then put them both in the freezer, the one with less water will freeze first (you can try this at home, but i recommend using plastic cups and not glass ones). now let's move on to the second part. let's say you have two glasses, and you fill one with really cold water that has been in the refrigerator, and the other with really hot water from the sink. if you put both of them in the freezer, the one that started out colder will freeze first. for the third part, let's imagine that you have two glasses with the same amount of water in them, and the water is at the same temperature. imagine putting one outside on a really really cold day in georgia, and having a friend in alaska put one outside on the same day. since it would be so much colder in alaska, the glass of water there would freeze before yours. so, if you took a tiny bit of really cold water in a glass, and put it outside on a cold day in alaska, it would freeze a lot faster than a big glass of hot water outside on a cold day in georgia.

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Toluene, c6h5ch3, is oxidized by air under carefully controlled conditions to benzoic acid, c6h5co2h...

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