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3 years ago

What is meant by the term activation energy?

1 answer:

5 0

The least amount of energy required to activate atoms or molecules to a state in which they can undergo a chemical reaction.

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How many molecules are in 3.8 mols of copper?

ioda

Answer:

Hi there!

The correct answer is 2.29 x $10^{24}$ molecules

Explanation:

To convert from the moles to molecules:

1 mole = 6.022 x 10²³ molecules

so basically you multiply 3.8 by 6.022 x 10²³

and you get: 2.29 x $10^{24}$

5 0

4 years ago

A student combined equal amounts of two solutions. One solution had a pH of 2 and the other had a pH of 12. Which would

Dahasolnce [82]

I think 6 is right.

5 0

2 years ago

Read 2 more answers

At a particular temperature a 2.00-L flask at equilibrium contains 2.80 ✕ 10-4 mol N2, 2.50 ✕ 10-5 mol O2, and 2.00 ✕ 10-2 mol N

zhenek [66]

Answer : The value of equilibrium constant (K) is, $5.71\times 10^4$

Explanation :

First we have to calculate the concentration of $N_2,O_2\text{ and }N_2O$

$\text{Concentration of }N_2=\frac{\text{Moles of }N_2}{\text{Volume of solution}}=\frac{2.80\times 10^{-4}mol}{2.00L}=1.4\times 10^{-4}M$

and,

$\text{Concentration of }O_2=\frac{\text{Moles of }O_2}{\text{Volume of solution}}=\frac{2.50\times 10^{-5}mol}{2.00L}=1.25\times 10^{-5}M$

and,

$\text{Concentration of }N_2O=\frac{\text{Moles of }N_2O}{\text{Volume of solution}}=\frac{2.00\times 10^{-2}mol}{2.00L}=1.00\times 10^{-2}M$

Now we have to calculate the value of equilibrium constant (K).

The given chemical reaction is:

$N_2(g)+O_2(g)\rightarrow 2N_2O(g)$

The expression for equilibrium constant is:

$K=\frac{[N_2O]^2}{[N_2][O_2]}$

Now put all the given values in this expression, we get:

$K=\frac{(1.00\times 10^{-2})^2}{(1.4\times 10^{-4})\times (1.25\times 10^{-5})}$

$K=5.71\times 10^4$

Thus, the value of equilibrium constant (K) is, $5.71\times 10^4$

7 0

4 years ago

What is the correct formula for phosphorus pentachloride? (a) PCl5 (b) P5Cl (c) P(ClO)5 (d) PO4Cl (e) PCIO

bearhunter [10]

Answer:

The correct formula for phosphorus pentachloride is a) PCl5

6 0

4 years ago

Read 2 more answers

Consider the balanced equation: N₂H₄ + 2 H₂O₂ → N₂ + 4 H₂O What are the mole ratios of hydrazine (N₂H₄) to hydrogen peroxide (H₂

IgorC [24]

Answer:

The answer is A, 1:2 and 1:4

Explanation:

This can be derived from looking at the balanced chemical equation. Notice the coefficients in front of each reactant and product. These show the mole ratios of each compound necessary to form the balanced equation.

N₂H₄ does not have a coefficient, which automatically becomes 1. H₂O₂ has a coefficient of 2, making the ratio between the two 1:2. H₂O has a coefficient of 4 making the ratio between hydrazine and water 1:4. Hope this helps!

5 0

4 years ago