Chemistry, 28.10.2019 21:31 paris4ever23

Two chemicals a and b are combined to form a chemical c. the rate, or velocity, of the reaction is proportional to the product of the instantaneous amounts of a and b not converted to chemical c. initially, there are 40 grams of a and 50 grams of b, and for each gram of b, 2 grams of a is used. it is observed that 15 grams of c is formed in 10 minutes. how much is formed in 20 minutes? (round your answer to one decimal place.)

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Answer from: annafellows

The correct answer is 23,4375 grams of C.

Explanation:

First, we will identify the limiting reagent, which is the one consumed first. Since each gram of B consumes two grams of A, the product to be consumed first is A.

We calculate the amount of A and B that is consumed in the first 10 minutes is 5 grams of B and 10 grams of A.

Now we calculate the constant that relates the speed of reaction to the amount of reagent in each component.

20 grams of B and 40 grams of A will react completely given the limiting reagent A. We calculate the constant that relates the reaction speed (grams of product/time) with the instantaneous amounts of unconverted A and B. We calculate the constant that relates the reaction speed (grams of product/time) with the instantaneous amounts of unconverted A and B. We calculate the constant that relates the reaction speed (grams of product/time) with the instantaneous amounts of unconverted A and B.

So:

15g/10min = k*(20g*40g)

k=1.5 g/min / 800 g^2

k=1,875 *10^-3 g^3 /min

Now, we calculate the amount of reagent that forms when 20 minutes pass:

x / 10 min = 1,875 *10^-3 g^3/min * (15g * 30g)

x= 8,4375 grams

So we can say that after 20 minutes, 23.4375 grams of C will form.

Have a nice day!

Answer from: Quest

You use the atomic number to find out how many protons and neutrons there are in the atom. you use the atomic mass to find out how many protons and electrons there are in the atom.

Answer from: Quest

answer: atomic mass was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version.

explanation:

originally atomic mass was used to arrange elements on the periodic table from left to right in a row. each column then shows similar properties of elements of a group.

in modern periodic table, the atoms are arranged in increasing atomic number. as atomic number represents the number of protons in an atom which is unique for every atom.

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