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3 years ago

Which of the following laboratory procedures best illustrates the law of conservation of mass?

Chemistry

2 answers:

77julia77 [94]3 years ago

4 0

Answer is: Synthesizing 36 g of H2O plus leftover reactants by combining 4 g of H2 and 32 g of O2.

m(H₂) + m(O₂) = m(H₂O).

4 g + 32 g = 36 g.

Conservation of mass: during chemical reaction no particles are created or destroyed, the atoms are rearranged from the reactants to the products.

Balanced chemical reaction: 2H₂ + O₂ → 2H₂O.

m(H₂) = 4 g; mass of hydrogen.

n(H₂) = 4 g ÷ 2 g/mol.

n(H₂) = 2 mol; amount of hydrogen.

m(O₂) = 32 g.

n(O₂) = 32 g ÷ 32 g/mol.

n(O₂) = 1 mol; amount of oxygen.

n(H₂) : n(O₂) = 2 mol : 1 mol according to balanced chemical reaction.

zavuch27 [327]3 years ago

4 0

Synthesizing 36 g of H2O because the mass of the reactants add up to the mass of the product

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Balance each reaction and write its reaction quotient, Qc:(b) SF₆(g) + SO₃(g) → SO₂F₂(g)

IceJOKER [234]

When we balance the given equation

SF₆(g) + SO₃(g) → SO₂F₂(g)

We will get

SF₆(g) + 2SO₃(g) → 3SO₂F₂(g)

Solution:

Balancing the given equaation

SF₆(g) + SO₃(g) → SO₂F₂(g)

We have to balance the given number of O

SF₆(g) + 2SO₃(g) → 3SO₂F₂(g)

We get balanced equation

SF₆(g) + 2SO₃(g) → 3SO₂F₂(g)

The reaction quotient will be

Qc = [product] / [reactant]

Qc = [SO₂F₂(g)] / [SF₆(g) + SO₃(g)]

To learn more click the given link

brainly.com/question/16025432

#SPJ4

4 0

2 years ago

The pressure on 150 mL of a gas is increased from 500 mm Hg to 700 mm Hg at constant temperature. What is the new volume of the

Ivanshal [37]

Answer:

Option A. 107 mL

Explanation:

From the question given above, the following data were obtained:

Initial volume (V₁) = 150 mL

Initial pressure (P₁) = 500 mmHg

Final pressure (P₂) = 700 mmHg

Temperature = constant

Final volume (V₂) =?

The final volume of the gas can be obtained by using the Boyle's law equation as shown below:

P₁V₁ = P₂V₂

500 × 150 = 700 × V₂

75000 = 700 × V₂

Divide both side by 700

V₂ = 75000 / 700

V₂ = 107 mL

Therefore, the final volume of the gas is 107 mL.

4 0

3 years ago

A reaction mixture, in an organic solvent, contains an organic acid, an organic base, neutral organic compounds, and base contai

zheka24 [161]

Answer: option b. Neutral organic compounds

Explanation:

3 0

3 years ago

An iron block of mass 18 kg is heated from 285 K to 318 K. If 267.3 kJ is required, what is the specific heat of iron? A. 450.00

valkas [14]

Answer:

Option A. 450.00

Explanation:

1) Data:

a) m = 18 kg

b) T₁ = 285 K

c) T₂ = 318 K

d) Q = 267.3 kJ

e) S = ?

2) Principles and equations

The specific heat of a substance is the amount of heat energy absorbed to increase the temperature of certain amount (gram, kg, or moles, depending on the definition or units) of the substance in 1 ° C or 1 K.

The mathematical relation between the specific heat and the heat energy absorbed is:

Q = m × S × ΔT

Where,

Q is the heat absorbed,
S is the specific heat, and
ΔT is the temperature increase (T₂ - T₁)

3) Solution:

a) Substitute the data into the equation:

267.3 kJ = 18 kg × S × (318 K - 285 K)

b) Solve for S and compute:

S = 267.3 kJ / (18 kg × 33 K) = 0.45 kJ / (Kg . K)

The options have not units, but I notice that the first answer is 1,000 times the answer I obtained, so I will make a conversion of units.

c) Convert to J /( kg . k):

0.45 kJ / (Kg . K) × 1,000 J / kJ = 450 J / (kg . K)

Now we can see that the option A is is the answer, assuming the units.

6 0

4 years ago

Calculate AH for the reaction: 2N2 (g) + 6H20 (g) → 302 (g) + 4NH3(g)

Ratling [72]

Answer:

Explanation:

4NH₃ (g) + 3O₂ (g) ⇒ 2N₂ (g) + 6H₂ O(1)

Δ $H_r={\sum}{ \Delta }H_f(\text{product})-{\sum}{ \Delta }H_f(\text{reactant})$

ΔH r =(2ΔH f(N 2 )+6ΔH f (H 2 O(l)))−(4ΔH f (NH 3 (g))+3ΔH f (O 2 (g)))

ΔH rex =[2×0+6×(−286)]−[4×(−46)+3×0]=−1716+186

ΔH rex =−1532kJ/mol

Thermodynamics is a branch of physical chemistry that studies heat and its effects and interactions. Governed by the four main laws, thermodynamics plays a huge role in physics and chemistry, and is also responsible for the law of conservation of energy, a fundamental rule in science.

7 0

2 years ago