All categories

2 years ago

How much lead(II) chromate (PbCrO4) is precipitated by mixing 100 mL of aqueous 3 M

Chemistry

1 answer:

ICE Princess25 [194]2 years ago

4 0

Answer:

38.8 g of PbCrO₄ are precipitated from the reaction

Explanation:

We have the following chemical reaction:

K₂CrO₄ (aq) + Pb(NO₃)₂ (aq) → 2 KNO₃ (aq) + PbCrO₄ (s)

where:

(aq) - aqueous

(s) - solid

Now we use the following formula to calculate the number of moles:

molar concentration = number of moles / volume (L)

number of moles = molar concentration × volume (L)

number of moles of K₂CrO₄ = 3 × 0.1 = 0.3 moles

number of moles of Pb(NO₃)₂ = 2 × 0.1 = 0.2 moles

We see from the chemical reaction that 1 mole of K₂CrO₄ will react with 1 mole of Pb(NO₃)₂ so 0.3 moles of K₂CrO₄ will react with 0.3 moles of Pb(NO₃)₂ but we have only 0.2 moles of Pb(NO₃)₂ available, so the limiting reactant is Pb(NO₃)₂. Taking this in account we devise the following reasoning:

if 1 moles of Pb(NO₃)₂ produces 1 mole of PbCrO₄

then 0.2 moles of Pb(NO₃)₂ produces X moles of PbCrO₄

X = 0.2 moles of PbCrO₄

number of moles = mass / molar weight

mass = number of moles × molar weight

mass of PbCrO₄ = 0.2 × 194 = 38.8 g

Learn more about:

molar concentration

brainly.com/question/14331620#

brainly.com/question/14133486

#learnwithBrainly

You might be interested in

Calculate the number of grams of carbon found in a 5 mole sample of carbon.

Ksenya-84 [330]

Answer:

60g

Explanation:

1mol of carbon has 12g

3 0

2 years ago

Sodium metal reacts with water to produce hydrogen gas and sodium hydroxide according to the chemical equation shown below.

UNO [17]

Answer: The enthalpy change of the reaction is -361.6 kJ

Explanation:

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

Moles of sodium = 0.025 moles

Molar mass of sodium = 23 g/mol

Putting values in above equation, we get:

$0.025mol=\frac{\text{Mass of sodium}}{23g/mol}\\\\\text{Mass of sodium}=(0.025mol\times 23g/mol)=0.575g$

We are given:

Mass of water = 100.00 g

Mass of sodium = 0.575 g

Mass of solution = 100.00 + 0.575 = 100.575 g

To calculate the amount of heat absorbed, we use the equation:

$q=m\times C\times \Delta T$

where,

q = amount of heat absorbed = ?

m = mass of solution = 100.575 g

C = specific heat capacity of solution = 4.18 J/g°C

$\Delta T$ = change in temperature = $(T_2-T_1)=(35.75-25.00)=10.75^oC$

Putting all the values in above equation, we get:

$q=100.575g\times 4.18J/g^oC\times 10.75^oC=4519.34J=4.52kJ$

When heat is absorbed by the solution, this means that heat is getting released by the reaction.

Sign convention of heat:

When heat is absorbed, the sign of heat is taken to be positive and when heat is released, the sign of heat is taken to be negative.

For the given chemical reaction:

$2Na(s)+2H_2O(l)\rightarrow NaOH(aq.)+H_2(g)$

When 0.025 moles of sodium is reacted, the heat released by the reaction is 4.52 kJ

So, when 2 moles of sodium will react, the heat released by the reaction will be = $\frac{4.52}{0.025}\times 2=361.6kJ$

Hence, the enthalpy change of the reaction is -361.6 kJ

6 0

2 years ago

Match each item with the correct statement below.

adell [148]

1. Formula

2. Compound

3. Properties

4. Solute

5. Mass

6. Matter

7. Alloy

8. aqueous solution

9. quantitative

5 0

3 years ago

Read 2 more answers

Convert 100 m/s into miles per hour. 100 m/s =

faust18 [17]

The answer is 100 m/s = 223.694. %100(not part of question)

6 0

2 years ago

Ions, isotope, average atomic mass fill in the blank

Zarrin [17]

For Row 1 according to the respective Column is

Zn^{2+} , 32 ,65 ,32 ,30 ,34 ,2+

For Row 2 according to the respective Column is

Mn, 25, 55, 25, 25,30, 3-

For Row 3 according to the respective Column is

P, 15, 31, 15 ,15 ,16 ,0

For Row 4 according to the respective Column is

O^{2-} , 8 ,16 ,8 ,6 ,8 , 2-

For Row 5 according to the respective Column is

Na, 11, 23, 11, 10, 12, 1-

From the question we are told

Ions, isotope, average atomic mass fill in the blank

Generally

Where

Z signifies the Proton Number of the atom
A signifies Mass Number of the atom

Therefore

For Row 1 according to the respective Column is

Zn^{2+} , 32 ,65 ,32 ,30 ,34 ,2+

For Row 2 according to the respective Column is

Mn, 25, 55, 25, 25,30, 3-

For Row 3 according to the respective Column is

P, 15, 31, 15 ,15 ,16 ,0

For Row 4 according to the respective Column is

O^{2-} , 8 ,16 ,8 ,6 ,8 , 2-

For Row 5 according to the respective Column is

Na, 11, 23, 11, 10, 12, 1-

For more information on this visit

brainly.com/question/1641336

4 0

1 year ago