According to the following reaction, what mass of PbCl2 can form from 235 mL of 0.110 M KCl solution? Assume that there is excess Pb(NO3)2. 2 KCl(aq) + Pb(NO3)2(aq) → PbCl2(s) + 2 KNO3(aq)

3.59 g of PbCl₂ can form from 235 mL of 0.110 M KCl solution.

Explanation:

2 KCl(aq) + Pb(NO₃)₂(aq) → PbCl₂(s) + 2 KNO₃(aq)

The Molarity (M) or Molar Concentration is the number of moles of solute (substance that is in minor proportion in a solution) that are dissolved in a certain volume.

The Molarity of a solution is determined by the following formula:

Molarity is expressed in units

Then, knowing that 235 mL is 0.235 L (1 L=1000 mL or 1 mL=0.001 L) and taking into account the molarity of KCl, you can apply a rule of three as follows: if in 1 L of KCl solution there are 0.110 moles of the substance, in 0.235 L of solution how many moles of KCl are there?

moles of KCl=0.02585

Another rule of three is applied as follows: by stoichiometry of the reaction you can see that 2 moles of KCl form 1 mole of PbCl₂. So if 0.02585 moles of KCl react, how many moles of PbCl₂ are formed?

moles of PbCl₂=0.012925

In the periodic table of elements you can see the following atomic masses:

Then the molar mass of PbCl₂ is:

PbCl₂= 207 g/mol + 2*35.45 g/mol= 277.9 g/mol

Then a last rule of three applies: if in 1 mole of PbCl₂ there are 277.9 g of the compound, in 0.012925 moles of PbCl₂ how much mass is there?

mass=3.59 g

3.59 g of PbCl₂ can form from 235 mL of 0.110 M KCl solution.

answer

fusion: the energy source of stars. the energy released from the collapse of the gas into a protostar causes the center of the protostar to become extremely hot. when the core is hot enough, nuclear fusion commences. fusion is the process where two hydrogen atoms combine to form a helium atom, releasing energy.

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