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Dafna1 [17]
2 years ago
14

Viết công thức hóa học tạo bởi Mg và O

Chemistry
1 answer:
jasenka [17]2 years ago
3 0
Phương trình hóa học: 2Mg+O2->2Mgo
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g The reaction; 4 Ag(s) + O2(g) ----> 2 Ag2O(s), is exothermic. Which statement about the reaction is correct? (A) It is spon
melomori [17]

Answer:

The correct answer is B. It is spontaneous only at low temperatures.

Explanation:

In thermodynamics, the Gibbs free energy is a thermodynamic potential that can be used to calculate the maximum of reversible work that may be performed by a thermodynamic system at a constant temperature and pressure.

The spontaneity of a reaction is given by the equation:

ΔG = ΔH - TΔS

where:

ΔH: enthalpy variation

T: absolute temperature

ΔS: entropy variation

As the reaction is exothermic, ΔH<0

As the reaction order increases (the reagents are solid and gas and their product is solid), ΔS<0

Therefore, the reaction will be spontaneous when ΔG is negative.

ΔG = ΔH - TΔS

That is, the entropy term must be smaller than the enthalpy term.

Hence, the reaction will be spontaneous only at low temperatures.

4 0
2 years ago
A sample has a pH of -0.248 (yes, it really is possible to have a negative pH). Find
dalvyx [7]

Answer:

pOH= 14.248

[H+]=1.77 M

[OH-]=5.65 x10^-15M

Explanation:

pH+pOH= 14

pOH= 14-pH

pOH=14-(-0.248)

pOH= 14.248

[H+]=10^-pH= 10^-(-0.248)=1.77 M

[OH-]=10^-pOH= 10^-14.248=5.65 x10^-15M

5 0
3 years ago
Which element is identified by the chemical symbol C?
GrogVix [38]

Answer:

B Carbon

Explanation:

I really hopes this helps you!

3 0
3 years ago
What is the molar mass of CaCl2?
kherson [118]

Answer: The correct option is 1.11\times 10^{2} g/mol

Explanation:

Atomic mass of calcium ,Ca = 40.07 g/mol

Atomic mass of chlorine ,Cl = 35.5  g/mol

Molar mass of CaCl_2:

= (Atomic mass of Ca+2 × (Atomic mass of Cl))

= (40.07 g/mol + (2 × 35.5))=111.07 g/mol

111.07=1.1107\times 10^{2} g/mol\approx 1.11\times 10^{2} g/mol

Hence, the correct option is 1.11\times 10^{2} g/mol



3 0
3 years ago
Which planet would an objects weight be the greatest
aleksley [76]

Explanation:

Jupiter is the largest planet in our Solar System with the most mass. Because of Jupiter's mass, you would weigh more on that planet than on any other one in our Solar System. If you weighed 68 kg on Earth then you would weigh 160.7 kg on Jupiter, over twice your normal weight.

5 0
3 years ago
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