All categories

3 years ago

Which of the following is true about glass recycling?

Chemistry

1 answer:

andriy [413]3 years ago

4 0

Answer: Recycling glass is an energy-saving practice.

Explanation:

You might be interested in

How does water cause weathering of a rock?

klio [65]

Answer:

water wears it down over time, eroding it and weathering it. This usually happens to rocks in creekbeds or near bodies of water

hope this helps :)

Explanation:

7 0

3 years ago

Calculate the mass of ZnCl2 produced by the reaction of 49.8 grams of H2. Zn + 2HCl ZnCl2 + H2

tester [92]

Answer:

3300.85 g

Explanation:

Given data:

Mass of ZnCl₂ produced = ?

Mass of H₂ produced = 49.8 g

Solution:

Chemical equation:

Zn + 2HCl → ZnCl₂ + H₂

Number of moles of H₂:

Number of moles = mass/molar mass

Number of moles = 49.8 g/ 2.056 g/mol

Number of moles = 24.22 mol

Now we will compare the moles of H₂ with ZnCl₂ form balance chemical equation.

H₂ : ZnCl₂

1 : 1

24.22 : 24.22

Mass of ZnCl₂:

Mass = number of moles × molar mass

Mass = 24.22 × 136.286 g/mol

Mass = 3300.85 g

6 0

3 years ago

Calculate ∆G ◦ r for the decomposition of mercury(II) oxide 2 HgO(s) → 2 Hg(ℓ) + O2(g) ∆H◦ f −90.83 − − (kJ · mol−1 ) ∆S ◦ m 70.

bagirrra123 [75]

Answer:

4. +117,1 kJ/mol

Explanation:

ΔG of a reaction is:

ΔGr = ΔHr - TΔSr (1)

For the reaction:

2 HgO(s) → 2 Hg(l) + O₂(g)

ΔHr: 2ΔHf Hg(l) + ΔHf O₂(g) - 2ΔHf HgO(s)

As ΔHf of Hg(l) and ΔHf O₂(g) are 0:

ΔHr: - 2ΔHf HgO(s) = 181,66 kJ/mol

In the same way ΔSr is:

ΔSr= 2ΔS° Hg(l) + ΔS° O₂(g) - 2ΔS° HgO(s)

ΔSr= 2* 76,02J/Kmol + 205,14 J/Kmol - 2*70,19 J/Kmol

ΔSr= 216,8 J/Kmol = 0,216 kJ/Kmol

Thus, ΔGr at 298K is:

ΔGr = 181,66 kJ/mol - 298K*0,216kJ/Kmol

ΔGr = +117,3 kJ/mol ≈ 4. +117,1 kJ/mol

I hope it helps!

5 0

3 years ago

Which type of wave does not require a medium to travel through?

nlexa [21]

Hello,

I'm not very sure but I think the correct answer is D) Water Wave

I really hope this helps!!!! Happy Holidays!!!! (:

8 0

3 years ago

Which is the average kinetic energy of the individual particles of a substance?

zhannawk [14.2K]

Answer: Temperature

Explanation: Temperature is a measure of average kinetic energy of particles in an object. The hotter the substance, higher is the average kinetic energy of its constituent particles. When we heat a substance, the particles that constitute the substance gain some energy and begin to move faster.

6 0

2 years ago