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Ganezh [65]
4 years ago
7

Chemistry help plz!​

Chemistry
2 answers:
dexar [7]4 years ago
4 0

Answer:

The answer to your question is Endothermic.

Explanation:

To know if a reaction is Endothermic or exothermic, most of the time in the reaction is mentioned the energy of the reaction and its sign, from this information we know the kind of reaction.

Also, we can know the kind of reaction by observing that the reactant is a solid and the product is a liquid, that indicates a physical change that needs energy to proceed, so we conclude that the reaction is endothermic.

NikAS [45]4 years ago
4 0
Exothermic becomes I just answer
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Calculate δg∘rxn and e∘cell for a redox reaction with n = 3 that has an equilibrium constant of k = 4.4×10−2. you may want to re
lapo4ka [179]
a) First, to get ΔG°rxn we have to use this formula when:

ΔG° = - RT ㏑ K 

when ΔG° is Gibbs free energy 

and R is the constant = 8.314 J/mol K

and T is the temperature in Kelvin = 25 °C+ 273 =  298 K 

and when K = 4.4 x 10^-2

so, by substitution:

ΔG°= - 8.314 * 298 *㏑(4.4 x 10^-2)

      = -7739 J  = -7.7 KJ


b) then, to get E
° cell for a redox reaction we have to use this formula:

ΔE° Cell = (RT / nF) ㏑K

when R is a constant = 8.314 J/molK

and T is the temperature in Kelvin = 25°C + 273 = 298 K

and n = no.of moles of e- from the balanced redox reaction= 3

and F is Faraday constant = 96485 C/mol

and K = 4.4 x 10^-2

so, by substitution:

∴ ΔE° cell = (8.314 * 298 / 3* 96485) *㏑(4.4 x 10^-2)

              = - 2.7 x 10^-2 V
  
8 0
3 years ago
Five moles of sulfur dioxide, soz, would consist of how many molecules?<br> molecules<br> Need Help?
Amiraneli [1.4K]

Answer:

3 x 10²⁴ molecules

Explanation:

A mole is just a name that we use to substitute a number, just like a dozen means 12, a mole means 6.022 x 10²³. This gives us the unit conversion of 6.022 x 10²³ molecules SO₂/1 mol SO₂.

5molSO2*\frac{6.022 x 10^2^3molecules}{1mol SO2} = 3.011 x 10^2^4moleculesSO2

Round to the lowest number of significant figures to get 3 x 10²⁴ molecules SO₂

8 0
4 years ago
What is the tail of a comet made of? A. Heat B. Asteroids C. Melted materials D. Solar wind
grigory [225]
It's actually made or gas and dust that can extend hundreds of millions of kilometers away from the coma. most comets actually have two tails a plasma tell made of ionized gas and a dust tail made of small solid particles.
3 0
3 years ago
Read 2 more answers
The melting of ice is considered a physical change because:
crimeas [40]

Answer: C Hope it helps

Explanation:

8 0
3 years ago
Let's say that you were given the following
mezya [45]

Answer:

V2~0.4839M

Explanation:

We're going to use Boyles law to answer the question.

Boyle's law:

P1V1=P2V2

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P2=166mmHg

V1=0.532L

V2=?

V2=(P1 x V1)/P2

V2=(151 x 0.532)/166

V2~0.4839M

Hope it helps:)

8 0
3 years ago
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