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3 years ago

What is the enthalpy of reaction for the decomposition of calcium carbonate?

Chemistry

1 answer:

lys-0071 [83]3 years ago

5 0

Answer:

Explanation:

You will need to look up the Standard Heats of Formation* for each substance and apply Hess's Law Equation.

ΔH⁰(rxn) = ∑ΔH⁰(Products) - ∑ΔH⁰(Reactants)

*Std Heats of Formation can be found in the appendix of most college chem texts.

For this problem:

Given CaCO₃(s) => CaO(s) + CO₂(g)

∑ΔH⁰: -635.1 Kj/mole -393.5Kj/mole -1206.9

ΔH⁰(rxn) = [(-393.5 Kj/mole) + (-393.5Kj/mole)] - (-1206.9Kj/mole)

= (-635.1 -393.5 + 1206.9) Kj/mole

= +178.3 Kj/mole

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The molarity of a solution of 2.0 mol of NaOH in 5.OL of solution?

Gnesinka [82]

Answer:

Explanation:

The molarity of the NaOH solution can be found by using the formula

$c = \frac{n}{v} \\$

c is the molarity

n is the number of moles

v is the volume in L

From the question we have

$c = \frac{2}{5} = 0.4 \\$

We have the final answer as

Hope this helps you

5 0

3 years ago

hich of the followings decrease the affinity of adult Hb with O2? A. 2,3 BPG B. hydrogen ion C. CO2 D. Ferrous ion

Ivahew [28]

Answer:

A. 2,3 BPG

Explanation:

2,3-bisphosphoglycerate (BPG), otherwise known as 2,3-DPG, enables the transition of hemoglobin from a very high-oxygen-affinity state to a reduced-oxygen-affinity state.

Tissues hemoglobin oxygen affinity is reduced by numerous physiological factors including.

1. Temperature Increased,

2. Carbon dioxide,

3. Acid and

4. 2,3-Bisphosphoglycerate (2,3-BPG)

all of which can contribute to decrease the oxygen affinity of hemoglobin which favours unloading and increased oxygen availability to our body cells.

3 0

3 years ago

What are example of gas

Katena32 [7]

Water vapor, nitrogen, oxygen, carbon dioxide, helium, argon, and neon

Hope I helped a bit
XD

5 0

3 years ago

Read 2 more answers

What would changing the number of electrons in a atom change

aksik [14]

Answer:

The mass of the atom will change

Explanation:

The mass of the atom will alter if the changing the amount of electrons in an atom charge would result in being positively or negatively charged (Correct me if I'm incorrect sorry If I got this wrong)

3 0

3 years ago

(Help would be greatly appreciated, chemistry is not my strong suit) How many moles of NaCl are present in a solution with a mol

tatyana61 [14]

Molarity is a unit of concentration defined as the number of moles of solute (the substance being dissolved) per volume of solution (the solvent in which all the solute is dissolved). Mathematically, molarity is expressed as

$M = \frac{\text{ mol solute}}{\text{ L solution}}$ .

In this question, we are given the molarity and the volume of a solution of NaCl. We can use this information to calculate the number of moles of NaCl present in the solution. Rearranging the equation to solve for moles of solute, we multiply the molarity by the volume of the solution (the units for volume must be in liters, so 125 mL is expressed as the equivalent 0.125 L):

$(8.59 \text{ M})(0.125 \text{ L}) = 1.07 \text{ moles of NaCl}.$

The question asks for the number of moles of NaCl in this solution, so number 3 would be correct.

8 0

3 years ago