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3 years ago

Why is it important to maintain a constant volume of reactants despite changing the relative amounts of reactants?

1 answer:

7 0

It is necessary for a reaction to occur under constant volume conditions so that the heat involved whether rejected or absorbed can be easily determined since this will be directly proportional to the change in temperature. Hope this answers the question.

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What is the molar mass of CH20?

cluponka [151]

Answer:

30.026 <em>g/mol</em>

Explanation:

no explaination

4 0

3 years ago

Why is water considered a pure substance and not a mixture?

Damm [24]

I believe it has something to do with the H2O molecules, because a chemical compound is not a mixture.

5 0

3 years ago

The following data was collected for the formation of ammonia (NH3) based on the following overall reaction: N2 + 3H2 = 2NH3 N2

notsponge [240]

Answer : The unit for the rate constant in the rate law for the formation of ammonia is, $M^{-2}min^{-1}$

Explanation :

Rate law is defined as the expression which expresses the rate of the reaction in terms of molar concentration of the reactants with each term raised to the power their stoichiometric coefficient of that reactant in the balanced chemical equation.

For the given chemical equation:

$N_2+3H_2\rightarrow 2NH_3$

Rate law expression for the reaction:

$\text{Rate}=k[N_2]^a[H_2]^b$

where,

a = order with respect to $N_2$

b = order with respect to $H_2$

Expression for rate law for first observation:

$0.0021=k(0.10)^a(0.10)^b$ ....(1)

Expression for rate law for second observation:

$0.0084=k(0.10)^a(0.20)^b$ ....(2)

Expression for rate law for third observation:

$0.0672=k(0.20)^a(0.40)^b$ ....(3)

Dividing 2 by 1, we get:

$\frac{0.0084}{0.0021}=\frac{k(0.10)^a(0.20)^b}{k(0.10)^a(0.10)^b}\\\\4=2^b\\b=2$

Dividing 3 by 1 and also put value of b, we get:

$\frac{0.0672}{0.0021}=\frac{k(0.20)^a(0.40)^2}{k(0.10)^a(0.10)^2}\\\\2=2^a\\a=1$

Thus, the rate law becomes:

$\text{Rate}=k[N_2]^a[H_2]^b$

$\text{Rate}=k[N_2]^1[H_2]^2$

Now, calculating the value of 'k' by using any expression.

$0.0021=k(0.10)^1(0.10)^2$

$k=2.1M^{-2}min^{-1}$

The value of the rate constant 'k' for this reaction is $2.1M^{-2}min^{-1}$

That means, the unit for the rate constant in the rate law for the formation of ammonia is, $M^{-2}min^{-1}$

7 0

4 years ago

Use the choices below to fill in the blanks. minerals are _________ inorganic _________ that usually possess a crystalline struc

babymother [125]

Specific inorganic compounds

6 0

3 years ago

What variables are considered when forecasting weather

saveliy_v [14]

There are lots of variables.
1. relative humidity
2. dew point temperature
3. air temperature
4. wind speeds
5. vapor pressure
6. latitude and longitude
7. orrographic lift (surface type)

there are probably more, but hope this helped! :)

4 0

3 years ago