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Answer:
B
Explanation:
Recall the law of effusion:
Because 5 mol of oxygen was effused in 10 seconds, the rate is 0.5 mol/s.
Let the rate of oxygen be <em>r</em>₁ and the rate of hydrogen be <em>r</em>₂.
The molecular weight of oxygen gas is 32.00 g/mol and the molecular weight of hydrogen gas is 2.02 g/mol.
Substitute and solve for <em>r</em>₂:
Because there are 5 moles of hydrogen gas:
In conclusion, it will take about 2.5 seconds for the hydrogen gas to effuse.
Check: Because hydrogen gas is lighter than oxygen gas, we expect that hydrogen gas will effuse quicker than oxygen gas.
- The chemical name for reactant side:
Al - Aluminium, Pb(NO3)2 - Lead(II) nitrate.
- The chemical name for product side:
Al(NO3)3 - Aluminium nitrate, Pb - lead.
<u>Explanation</u>:
- This is an oxidation-reduction (redox) reaction:
3 + 6 e- → 3
(reduction)
2 - 6 e- → 2
(oxidation)
Pb(NO3)2 is an oxidizing agent, Al is a reducing agent.
- Reactants:
Al uminium
Names: Aluminum, Aluminium powder, Al
Appearance: Silvery-white-to-grey powder, Silvery-white,
malleable, ductile, odorless metal.
Pb(NO3)2 – Lead(II) nitrate
Other names: Lead nitrate, Plumbous nitrate, Lead dinitrate
Appearance: White colorless crystals, White or colorless crystals
- Products:
Al(NO3)3 – Aluminium nitrate
Other names: Nitric Aluminum salt, Aluminum nitrate,
Aluminium(III) nitrate
Appearance: White crystals, solid | hygroscopic
Pb - lead
Names: Lead, Lead metal, Plumbum
Appearance: Bluish-white or silvery-grey solid in various forms.
Turns tarnished on exposure to air. A heavy, ductile,
soft, gray solid.