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leva [86]
2 years ago
9

As ___ increases,___ increases

Chemistry
1 answer:
Goshia [24]2 years ago
8 0

Answer:

if the force applied increases

if the area of contact increases

Explanation:

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An industrial vat contains 650 grams of solid lead(II) chloride formed from a reaction of 870 grams of lead(II) nitrate with exc
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Answer:

88.98 %.

Explanation:

  • From the balanced equation:

<em>2HCl + Pb(NO₃)₂ → 2HNO₃ + PbCl₂</em>

  • It is clear that 1.0 mole of Pb(NO₃)₂ reacts with 2.0 moles of HCl to produce 1.0 mole of PbCl₂ and 2.0 moles of HNO₃.
  • <em>The percent yield % of lead(II) chloride (PbCl₂) = [(actual yield) / (calculated yield)] x 100.</em>
  • The actual yield of lead(II) chloride (PbCl₂) = 650 g.
  • Now, we need to calculate the calculated yield of lead(II) chloride (PbCl₂).
  • We need to calculate the no. of moles (n) of lead(II) nitrate (Pb(NO₃)₂) (870 grams) using the relation: <em>n = mass / molar mass.</em>
  • n of lead(II) nitrate (Pb(NO₃)₂) = mass / molar mass = (870 g) / (331.2 g/mol) = 2.63 mol.
  • Since HCl is in excess, the limiting reactant is lead(II) nitrate (Pb(NO₃)₂).

<u><em>Using cross multiplication:</em></u>

1.0 mole of Pb(NO₃)₂ produces → 1.0 mole of PbCl₂, from the stichiometry.

∴ 2.63 mole of Pb(NO₃)₂ produces → 2.63 mole of PbCl₂.

  • The mass of PbCl₂ produced (the calculated yield) = n x molar mass = (2.63 mol) (278.1 g/mol) = 730.52 g.

∴ The percent yield % of lead(II) chloride (PbCl₂) = [(actual yield) / (calculated yield)] x 100 = [(650 g) / (730.52)] x 100 = 88.98 %.

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