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3 years ago

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Consider the unbalanced chemical equation hf + al -> alf3 + h2. when coefficients are added to balance the equation, which tw

o substances have a coefficient of two?
a. hf
b. alf3
c. h2
d. al

1 answer:

Mama L [17]3 years ago

5 0

Answer:

a

Explanation:

because you need to add 2 to to hf to make it equal to h2

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Determine the number of moles of O,(g) in the cylinder. The gram-formula mass of

FrozenT [24]

The number of mole of oxygen gas, O₂ in the cylinder given the data is 0.5 mole

<h3>Description of mole </h3>

The mole of a substance is related to it's mass and molar mass according to the following equation:

Mole = mass / molar mass

<h3>How to determine the mole of O₂</h3>

From the question given, the following data were obtained:

Mass of O₂ = 16 g g
Molar mass of O₂ = 32 g/mol
Mole of O₂ =?

Mole = mass / molar mass

Mole of O₂ = 16 / 32

Mole of O₂ = 0.5 mole

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2 years ago

A 1.00-L flask was filled with 2.00 moles of gaseous and 2.00 moles of gaseous and heated. After equilibrium was reached, it was

Bogdan [553]

Answer:

2.35

Explanation:

<em>A 1.00-L flask was filled with 2.00 moles of gaseous SO₂ and 2.00 moles of gaseous NO₂ and heated. After equilibrium was reached, it was found that 1.21 moles of gaseous NO was present. Assume that the reaction </em>

<em>SO₂ + NO₂ ⇌ SO₃ + NO </em>

<em>occurs under these conditions. Calculate the value of the equilibrium constant, K, for this reaction.</em>

<em />

Step 1: Calculate the molar concentrations

Since the reaction takes place in a 1.00 L flask, the molar concentrations are:

[SO₂]i = 2.00 M

[NO₂]i = 2.00 M

[NO]eq = 1.21 M

Step 2: Make an ICE chart

SO₂ + NO₂ ⇌ SO₃ + NO

I 2.00 2.00 0 0

C -x -x +x +x

E 2.00-x 2.00-x x x

Step 3: Calculate the concentrations at equilibrium

The concentration of NO at equilibrium is 1.21 M. Then, x = 1.21.

[SO₂]eq = 2.00-1.21 = 0.79 M

[NO₂]eq = 2.00-1.21 = 0.79 M

[SO₃]eq = x = 1.21 M

[NO]eq = x = 1.21 M

Step 4: Calculate the value of the equilibrium constant, K, for this reaction

K = [SO₃] × [NO]/[SO₂] × [NO₂]

K = 1.21²/0.79² = 2.35

6 0

3 years ago

Convert 25 gram of carbon dioxide to mold

Rus_ich [418]

The atomic weight of carbon dioxide is about 12.011 + 15.999 + 15.999 = 44.009.

44.009 grams of CO2 = 1 mole of CO2 CO2 = Carbon dioxide

25 ÷ 44.009 ≈ 0.568

About 0.568 moles of CO2

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4 years ago

List three ways in witch the water reaches the atmosphere

meriva

Three ways water reaches from earth to atmosphere are
1. direct evaporation from the water bodies like sea,river,oceans
2. moisture from the land(you must have seen land dries out)
3.moisture from the plant(small capillaries from the plants sucks water from land n goes to atmosphere in form of vapour from leaves)

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3 years ago

Minerals in geodes form spectacular euhedral crystals because ________. A. all of the elements incorporated in the crystals are

11111nata11111 [884]

Answer:

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Explanation:

This is true going by the facts that, it is only the silicates that can be able to form crystals as obtainable in diamonds etc. Since the minerals in geodes are in the framework of silicates families, they can be able to form euhedral crystals.

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3 years ago