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4 years ago

State and explain the hess's law

Chemistry

2 answers:

Vanyuwa [196]4 years ago

5 0

Answer:

Hess's Law of Constant Heat Summation (Hess's Law) states that regardless of the multiple stages or steps of a reaction, the total enthalpy change for the reaction is the sum of all changes

Explanation:This law is a manifestation that enthalpy is a state function.

Temka [501]4 years ago

3 0

Answer:

I had to do some research, because I not familiar with Hess's Law.

Hope this helps :)

Stating Hess's Law

Hess's Law is the most important law in this part of chemistry. Most calculations follow from it. It says "The enthalpy change accompanying a chemical change is independent of the route by which the chemical change occurs."

Explaining Hess's Law

Hess's Law is saying that if you convert reactants A into products B, the overall enthalpy change will be exactly the same whether you do it in one step or two steps or however many steps.

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How many milliliters of 0.121 M HCl are needed to neutralize 44.3 mL 0.274 M Ba(OH)2? Write the equation and don't forget to bal

Sergeeva-Olga [200]

Answer:

100 mL is the volume of HCl needed to neutralize the 44.3 of Ba(OH)₂

Explanation:

This is the chemical equation:

2HCl + Ba(OH)₂ → BaCl₂ + 2H₂O

Formula for neutralization is:

Molarity of acid . Volume of acid = Molarity of base . Volume of base

0.121 . Volume of acid = 0.274 . 44.3

Volume of acid = (0.274 . 44.3) / 0.121 → 100

6 0

3 years ago

It’s about electron configuration

Goryan [66]

Answer:

True

Explanation:

A metal , has 1 electron on the last level, so it can become (A^+1)

C, non-metal, has 7 electrons on the last level, so it can become (C^-1)

Compound AC is possible

3 0

3 years ago

7. A square chunk of plastic has a length of 5 cm, width of 5 cm and height of 5 cm. It has a mass of 200 g. What is its density

BaLLatris [955]

Answer:

$d=1.6\ g/cm^3$

Explanation:

Given that,

The dimension of a square chunk of plastic is 5 cm × 5 cm × 5 cm

Mass, m = 200 g

We need to find its density

Density = mass/volume

It will form a cube. It volume = side³

So,

$d=\dfrac{200\ g}{5^3\ cm^3}\\\\d=1.6\ g/cm^3$

Hence density is $1.6\ g/cm^3$

5 0

4 years ago

Sulfuric acid is a strong acid. Write the balanced molecular equation for the reaction of aqueous sulfuric acid and aqueous pota

Alik [6]

Answer:

one

Explanation:

I hope this will help you

3 0

2 years ago

For the reaction Cu2S(s)⇌2Cu+(aq)+S2−(aq)Cu2S(s)⇌2Cu+(aq)+S2−(aq), the equilibrium concentrations are as follows: [Cu+]=1.0×10−5

klio [65]

Answer:

1x10⁻¹²

Explanation:

Cu₂S(s) ⇌ 2Cu⁺(aq) + S²⁻(aq)

At equilibrium:

[Cu⁺] = 1.0x10⁻⁵ M

[S²⁻] = 1.0x10⁻² M

The equilibrium constant for the the reaction can be written as:

Keq = [Cu⁺]² * [S²⁻]

[Cu⁺] is squared because it has a stoichiometric coefficient of 2 in the reaction. <em>Cu₂S has no effect on the constant because it is a solid</em>.

Now we can <u>calculate the equilibrium constant</u>:

Keq = (1.0x10⁻⁵)² * 1.0x10⁻² = 1x10⁻¹²

8 0

3 years ago

State and explain the hess's law​

State and explain the hess's law