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AysviL [449]
3 years ago
12

Fill in the blank with the correct number to balance the equation: 4Cr + 3O2 → ___Cr2O3. (Enter only a whole number.)

Chemistry
2 answers:
Tamiku [17]3 years ago
8 0

The answer should be 2.

You're welcome!

aleksklad [387]3 years ago
7 0

Answer:

2

Explanation:

In order to balance an equation the same amount of atoms of each element in the reactants (the substances on the left of the arrow) must appear in the products (the substances on the right of the arrow). In this particular case, we see that there are 4 Cr atoms and 3*2 = 6 Oxygen atoms as reactants, and the molecule formed has 2 Cr atoms and 3 Oxygen atoms, so if we multiplied the number of molecules by 2, then the equation get balanced, that is:

4Cr + 3O2 -> 2 Cr2O3

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____ KClO3-----> ____ KCl + ____O3
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Read 2 more answers
For a gaseous reaction, standard conditions are 298 K and a partial pressure of 1 atm for all species. For the reaction 2 NO ( g
enyata [817]

Answer:

ΔG = -61.5 kJ/mol (<u>Spontaneous process</u>)

Explanation:

2 NO (g)  +  O₂  (g)   ⇄  2NO₂ (g)

Let's apply the thermodynamic formula to calculate the ΔG

ΔG = ΔG° + R .T . lnQ

We don't know if the gases are at equilibrium, that's why we apply Q (reaction quotient)

ΔG = - 69 kJ/mol + 8.31x10⁻³ kJ/K.mol . 298K . ln Q

How can we know Q? By the partial pressures (Qp)

P NO = 0.450atm

PO₂ = 0.1 atm

PNO₂ = 0.650 atm

Qp = [NO₂]² / [NO]² . [O₂]

Qp = 0.650² / 0.450² . 0.1 = 20.86

ΔG = - 69 kJ/mol + 8.31x10⁻³ kJ/K.mol . 298K . ln 20.86

ΔG = -61.5 kJ/mol (<u>Spontaneous process</u>)

5 0
3 years ago
3. You are asked to prepare an aqueous solution. What would be a better choice for a solute potassium nitrate or
liubo4ka [24]

Answer:

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Explanation:

8 0
3 years ago
Pls help
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Answer:

• None of these

Explanation:

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#Rastaman

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