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ZanzabumX [31]
3 years ago
7

What is it?

Chemistry
1 answer:
arlik [135]3 years ago
8 0

Answer:

The correct reaction is as follows:

2Mg + O2 → 2MgO

3. Synthesis

Explanation:

Chemical reactions are of different types depending on how they occur. One of these types is called SYNTHESIS OR COMBINATION REACTION. A synthesis reaction is that reaction in which two atoms of two elements are chemically combined to form a single molecule or compound. That is;

A + B → AB.

This is the case in this question where atoms of Magnesium (Mg) and oxygen (O) reacted to form a single compound of Magnesium oxide (MgO). Hence, it is said to be a SYNTHESIS REACTION.

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9. Calculate the standard enthalpy of the 3rd reaction using the given data: A,H° = +52.96 kJ/mol AFH= -483.64 kJ/mol H2s)+I202
Mice21 [21]

Answer:

-586.56 kJ/mol is the standard enthalpy of the 3rd reaction.

Explanation:

H_2(g) +I_2(s) \rightarrow 2 HI(g) ,\Delta H^{o}_{1}= +52.96 kJ/mol...[1]

2 H_2(g) + O_2(g)\rightarrow 2 H_2O(g),\Delta H^{o}_{2}=-483.64 kJ/mol...[2]

4 HI(g)+O_2(g)\rightarrow 2 I_2(s)+2 H_2O(g) ,\Delta H^{o}_{3} =?..[3]

The unknown standard enthalpy of third reaction can be calculated by using Hess's law:

The law states that 'the heat absorbed or evolved in a given chemical equation is the same whether the process occurs in one step or several steps'.

[2] - 2 × [1] = [3]

O_2+4HI\rightarrow 2H_2O(g)+2I_2(s)

\Delta H^{o}_{3}=\Delta H^{o}_{2}-2\times \Delta H^{o}_{1}

=-483.64 kJ/mol - 2\times (52.96 kJ/mol)=-586.56 kJ/mol

The standard enthalpy of the 3rd reaction is -586.56 kJ/mol.The negative sign indicates that energy is released during this reaction.

6 0
3 years ago
How many grams are there in 6 moles of h2o?
Alexandra [31]
N= g/m therefore g=n*m so you do...
G = 6 * (Molar mass of H2O )
G = 6 * (1.01 x 2)+(16)
G = 6 * (18.02)
G = 108.12 grams of H2O
5 0
4 years ago
Which formula represents a salt? <br><br> KOH <br><br> KCl <br><br> CH3OH <br><br> CH3COOH
Licemer1 [7]

Answer:

kci represents the formula of salt

3 0
4 years ago
Describe how you mathematically convert the measured mass of a
RoseWind [281]

Answer:

no. of moles = measured mass of substance/ molar mass of the constituted elements

Explanation:

No. of moles of 2.0g NaCl= 2/(23+35.5) = 0.034mol

3 0
3 years ago
Which statement is part of the kinetic molecular theory?
Goryan [66]

Answer:

Explanation:

B

7 0
3 years ago
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