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3 years ago

Complete the following chemical formula and determine the final molarity of NaCl:

Chemistry

1 answer:

Reika [66]3 years ago

6 0

Answer:

[NaCl] = 1.72 M

Explanation:

First of all, we balance the equation:

BaCl₂ + Na₂SO₄ → 2NaCl + BaSO₄

We convert mass of barium chloride to moles

45 g . 1mol / 208.23g = 0.216 moles

Ratio is 1:2. This means, that our moles of reactant may produce the double of moles, of product.

0.216 . 2 = 0.432 moles of NaCl are been produced.

Molarity is mol/L. We convert volume of water from mL to L

250 mL . 1L /1000 mL = 0.250 L

[NaCl] = 0.432 mol/0.250L = 1.72 M

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What is equation for Na + Br2= NaBr

NeX [460]

Should be 2Na + Br2 = 2NaBr :)

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3 years ago

a 45g sample of water at 12°c is heated with 15kJ of energy. What will be the final temperature of the water?

Marizza181 [45]

Answer:

Final temperature = 91.75 °C

Explanation:

Given data:

Mass of water = 45 g

Initial temperature = 12 °C

Energy required = 15 Kj (15000 j)

Final temperature = ?

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

Solution:

Q = m.c. ΔT

15000 j = 45 g × 4.18 j/g.°C × (T2 -T1)

15000 j = 45 g × 4.18 j/g.°C × (T2- 12 °C)

15000 j = 188.1 J/°C × (T2- 12 °C)

15000 j / 188.1 J/°C = T2- 12 °C

79.745 °C = T2 - 12 °C

T2 = 79.745 °C + 12 °C

T2 = 91.75 °C

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3 years ago

You draw back on the piston of a pump and the volume of air in the pump doubles. Which of the following happens?

ohaa [14]

Answer: The correct answer is Option C.

Explanation:

We are given a piston of a pump, which means that there is no loss of the air. and there is a change in pressure and volume but temperature of the system remains constant.

As, the pressure of the system increases, there will be more number of particles. So, the number of collisions per unit area will increase.

$\text{Number of collisions}\propto \text{Pressure}$

But in the question, volume gets doubled. So, the pressure will be determined by using Boyle's Law:

$P\propto \frac{1}{V}$

$V_2\rightarrow 2V_1$

where, $V_1\text{ and }V_2$ are the initial and final volume respectively.

Putting the change in volume in above equation, we get:

$P_2=\frac{1}{2V_1}\\\\P_2=\frac{1}{2}P_1$

where, $P_1\text{ and }P_2$ are the initial and final pressure respectively.

As, the pressure is reduced to half of the initial pressure. So, the number of collisions per unit area will also be reduced to one-half.

Hence, the correct answer is Option C.

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3 years ago

Read 2 more answers

Is the movement of plates to form land masses is called plate tectonics

joja [24]

Yes the movement of land forms is called the movment of plate tectonics. :) plz thnk me

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4 years ago

What are 2 factors that impact the flow of energy into and out of earths systems

Andre45 [30]

Answer:

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Explanation:

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3 years ago