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3 years ago

13

Which best defines a service? a task that is performed in exchange for payment an object that is acquired a plan that is execute

d an image that is drawn

2 answers:

tatiyna3 years ago

8 0

Answer:

a task that is performed for payment

Explanation:

all of the other answers do not pertain to the question

IrinaK [193]3 years ago

6 0

Answer:

the first option is correct (A)

Explanation:

Why would I lie?

:)

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Plzz write a small pharghraph

sergiy2304 [10]

Mass = reactencts, 73g

4 0

3 years ago

N₂O(g) + 3 H₂(g) N₂H4(1) + H₂O(1) AH = -317 kJ/mol

docker41 [41]

Answer:

A

Explanation:

Recall that Δ<em>H</em> is the sum of the heats of formation of the products minus the heat of formation of the reactants multiplied by their respective coefficients. That is:

$\displaystyle \Delta H^\circ_{rxn} = \sum \Delta H^\circ_{f} \left(\text{Products}\right) - \sum \Delta H^\circ_{f} \left(\text{Reactants}\right)$

Therefore, from the chemical equation, we have that:

$\displaystyle \begin{aligned} (-317\text{ kJ/mol}) = \left[\Delta H^\circ_f \text{ N$_2$H$_4$} + \Delta H^\circ_f \text{ H$_2$O} \right] -\left[3 \Delta H^\circ_f \text{ H$_2$}+\Delta H^\circ_f \text{ N$_2$O}\right] \end{aligned}$

Remember that the heat of formation of pure elements (e.g. H₂) are zero. Substitute in known values and solve for hydrazine:

$\displaystyle \begin{aligned} (-317\text{ kJ/mol}) & = \left[ \Delta H^\circ _f \text{ N$_2$H$_4$} + (-285.8\text{ kJ/mol})\right] -\left[ 3(0) + (82.1\text{ kJ/mol})\right] \\ \\ \Delta H^\circ _f \text{ N$_2$H$_4$} & = (-317 + 285.8 + 82.1)\text{ kJ/mol} \\ \\ & = 50.9\text{ kJ/mol} \end{aligned}$

In conclusion, our answer is A.

5 0

2 years ago

Continental crust is younger than oceanic crust.

tankabanditka [31]

Answer:

The answer is true.

Explanation:

Hello! Let's solve this!

The answer is true.

When a crust undergoes great tension, a crack opens and the oceanic crust begins to form. As the crack enlarges, the continent is splitting. Thus an oceanic crust forms. So the oceanic crust is younger than the earth's crust.

7 0

3 years ago

Read 2 more answers

Which of the following statements about the greenhouse effect is false? Greenhouse gases include carbon dioxide, chlorofluorocar

7nadin3 [17]

B is definitely correct

5 0

3 years ago

A balloon is filled to a volume of 2.20L at a temperature of 22*C. The balloon is then heated to a temperature of 71*C. Find the

goldfiish [28.3K]

2.565L

Explanation:

Charles law states that the volume of an ideal gas at constant pressure is directly proportional to the absolute temperature.V/T=K

V1/T1=V2/T2

Unit of Kelvin = 273.15

To get the absolute temperature, we need to convert the degree celsius temperature to kelvin.

T1= 22+273.15= 295.15 K

T2 = 71+273.15= 344.15 K

V1 = 2.20 L

V2 =?

2.20/295.15=V2/344.15

0.00745 x 344.15 = 2.565 L

Hence, 2.565 L is the new volume of the balloon.

3 0

3 years ago