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2 years ago

8

If a chemical reaction is reversed what happens to the enthalpy of the reaction

2 answers:

FrozenT [24]2 years ago

3 0

If a reaction is reversed then the enthalphy is exactly the same value but times (-1).

ivolga24 [154]2 years ago

3 0

<u>Answer:</u>

<em>When the chemical reaction reverses the sign that the enthalpy of reaction is carrying also reverses.</em>

<u>Explanation:</u>

When a chemical reaction takes place there is a certain amount of heat absorbed or released during the reaction. This changes in net heat that is being released or being absorbed is known as enthalpy.

When the reaction just becomes opposite the sign of the enthalpy also changes. That is when the chemical reaction is reversed the heat that was being absorbed would be released. Since there is a change in absorption or release of heat so that is what the sign if the enthalpy would show.

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Melatonin has the chemical formula C13H16N2O2. Less than 10 milligrams(0.01g) Convert the melatonin to moles

oee [108]

Answer: There are 0.000043 moles of melatonin.

Explanation:

According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number $6.023\times 10^{23}$ of particles.

To calculate the moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}$

given mass = 10 mg = 0.01 g

molar mass of $C_{13}H_{16}N_2O_2$ = 232.28 g

${\text {moles of melatonin}}=\frac{0.01g}{232.28g/mol}=0.000043moles$

Thus there are 0.000043 moles of melatonin

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Why this process is called a cycle

Greeley [361]

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19 The coefficients in a balanced chemical equation represent(l ) the mass ratios of the substances in the reaction(2) the mole

Andrews [41]

2. The coefficients represent to molar ratios in a balanced equation.

8 0

2 years ago

How many grams are in 1 mole of Ar?

Ilia_Sergeevich [38]

Answer: 39.948 grams

Explanation:

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g Write a molecular equation for the precipitation reaction that occurs (if any) when the following solutions are mixed. If no r

Mrac [35]

Answer:

CuBr₂(aq) + Pb(CH₃COO)₂(aq) → Cu(CH₃COO)₂(aq) + PbBr₂ (s)↓

Explanation:

We identify the reactants:

CuBr₂ and Pb(CH₃COO)₂

The products will be: Cu(CH₃COO)₂ and PbBr₂

You may know these information:

Salts from acetate are soluble.

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PbBr₂ is formed, so this will be our precipitate

The equation is:

CuBr₂(aq) + Pb(CH₃COO)₂(aq) → Cu(CH₃COO)₂(aq) + PbBr₂ (s)↓

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2 years ago