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3 years ago

Very important !!!!!!!!!!!!

Chemistry

1 answer:

Mademuasel [1]3 years ago

8 0

They speed up reactions by lowering activation energy. Many enzymes change shape when substrates bind.

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How many liters of C3H6O are present in a sample weighing 25.6 grams?

lawyer [7]

To Find :

Number of moles of C₃H₆O present in a sample weighing 25.6 grams.

Solution :

Molecular mass of C₃H₆O is :

M = (6×12) + (6×1) + (16×1) grams

M = 94 grams/mol

We know, number of moles of 25.6 grams of C₃H₆O is :

$n = \dfrac{Given \ Mass \ Of \ C_3H_6O }{Molar\ Mass \ Of \ C_3H_6O }\\\\n = \dfrac{25.6}{94}\ mole\\\\n = 0.27 \ mole$

Hence, this is the required solution.

4 0

3 years ago

Hippuric acid (HC9H8NO3)(HC9H8NO3), found in horse urine, has pKa=3.62pKa=3.62. Part A Calculate the pHpH in 0.140 MM hippuric a

Oxana [17]

Answer:

The pH in 0.140 M hippuric acid solution is 2.2.

Explanation :

Dissociation constant of the acid = $K_a$

$pK_a=-\log[K_a]$

$3.62=-\log[K_a]$

$K_a=2.399\times 10^{-4}$

Concentration of hippuric acid = c = 0.140 M

$HC_9H_8NO_3\rightleftharpoons C_9H_8NO_{3}^-+H^+$

Initially

c 0 0

At equilibrium

(c-x) x x

Concentration of acid = c $[HC_9H_8NO_3]=0.140 M$

Dissociation constant of an acid is given by:

$K_a=\frac{[C_9H_8NO_{3}^-][H^+]}{[HC_9H_8NO_{3}]}$

$K_a=\frac{x\times x}{(c -x)}$

$2.399\times 10^{-4}=\frac{x\times x}{(0.140 -x)}$

Solving for x:

x = 0.005677 M

$[H^+]=x = 0.005677 M$

The pH of the solution :

$pH=-\log[H^+]$

$pH=-\log[0.005677 M]=2.246\approx 2.2$

The pH in 0.140 M hippuric acid solution is 2.2.

6 0

4 years ago

A substance that gives up a proton during a chemical reaction, raising the hydrogen ion concentration of water, is most appropri

AleksandrR [38]

The answer is an acid.

That is a substance that gives up a proton during a chemical reaction, raising the hydrogen ion concentration of water, is most appropriately called an acid.

Acid is a substance that gives protons in its aqueous solution, and that the hydrogen ion concentration of that aqueous solution .

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4 years ago

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I need help badly?? It's scince and I can't figure it out..

Art [367]

i did this! Your lucky :)

Hopefully this will help you out!

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4 years ago

Many industrial reactions, like the reaction of nitrogen gas (N2) and hydrogen gas (H2) to produce ammonia for fertilizers, have

Jobisdone [24]

Catalysts always quicken the experiment

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3 years ago