Answer:
<h3>
1) 208.09 g</h3><h3>
2) 7.11 × 10²² particles</h3>
<h2>
Explanation:</h2><h3>
NUMBER ONE</h3>
<u>Find moles of Known Substance (NaCl)</u>
Moles of NaCl = mass ÷ molar mass
= 114.25 g ÷ 58.44 g/mol
= 1.955 mol
<u>Use Mole Ratio of Known to Unknown (NaCl : NaClO₃) to Determine Moles of Unknown</u>
The mole ratio of NaCl to NaClO₃ is 2 to 2 or simply 1 to 1.
This means that for each mole of NaCl produced the same number of moles of NaClO₃ was decomposed.
∴ since moles of NaCl = 1.955 mol,
then moles of NaClO₃ = 1.955 mol
<u>Find Mass of Unknown </u>
Mass of NaClO₃ = moles × molar mass
= 1.955 mol × 106.44 g/mol
= 208.09 g
<h3>NUMBER TWO</h3>
<u>Determine the Moles of Known (O₂)</u>
moles of O₂ = (volume × density) ÷ molar mass
= (68.30 L × 0.0828 g/L) ÷ 32 g/mol
= 0.177 mol
<u>Use Mole Ratio of Known to Unknown (O₂ : NaClO₃) to Determine Moles of Unknown</u>
Mole ratio of O₂ : NaClO₃ is 3 : 2. Therefore for each mole of oxygen produced, ²/₃ the moles of NaClO₃ is produced.
∴ if moles of O₂ = 0.177 mol
then moles of NaClO₃ = 0.177 mol × ²/₃
= 0.118 mol
<u>Find the Number of Particles of Unknown</u>
Number of particles = moles × Avogadro's Number
= 0.118 mol × (6.022 × 10²³ particles/mol)
= 7.11 × 10²² particles
