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Darya [45]
4 years ago
8

Which term best defines the controlled, measured addition of the amount of a solution of known concentration required to react c

ompletely with a measured amount of a solution of unknown concentration?
A. titration
B. sublimation
C. acidification
D. saponification
Chemistry
1 answer:
Elanso [62]4 years ago
3 0
That's a titration when you have volume and concentration of 1. and volume but no concentration of 2.
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Whenever energy is ______ from one form to another, some of that energy is lost by being changed into heat.
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How many moles are im 8.31x1023 molecules of h2so4​
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Answer:

1.38 mol.

Explanation:

  • It is known that every 1.0 mole of a molecule contains Avogadro's number of molecules (NA = 6.022 x 10²³).

<em><u>Using cross multiplication:</u></em>

1.0 mole of H₂SO₄ contains → 6.022 x 10²³ molecules.

??? moles of H₂SO₄ contains → 8.31 x 10²³ molecules.

<em>∴ The no. of moles in (8.31 x 10²³ molecules) of H₂SO₄ </em>= (1.0 mol)(8.31 x 10²³) / (6.022 x 10²³ molecules) = <em>1.38 mol.</em>

4 0
3 years ago
Given the following proposed mechanism, predict the rate law for the overall reaction. A2 + 2 B → 2 AB (overall reaction) Mechan
nlexa [21]

Answer:

The rate of the over all reaction is ;

R=K[A_2]^{1/2}[B]

Explanation:

Step 1 : A_2\rightleftharpoons 2 A fast

Step 2  : A + B\rightarrow AB slow

Equilibrium constant of the reaction in step 1:

K_1=\frac{[A]^2}{[A_2]}....[1]

Overall reaction:

A_2 + 2 B \rightarrow 2 AB

When there is a chemical reaction which taking place in more than 1 step than the rate of the over all reaction is determined by the slowest step occurring during that process;

Here step 2 is slow step, so the rate of the reaction will be;

R=k[A][B]..[2]

Putting value of [A] from [1] in [2]:

R=k\times \sqrt{K_1\times [A_2]}\times [B]

K=k\times (K_1)^{1/2}

K = rate constant of the reaction

The rate of the over all reaction is ;

R=K[A_2]^{1/2}[B]

5 0
3 years ago
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