📘 Number of Moles Calculation
Step 1: Given Data
Mass of NaCl = 5.85 g
We need to calculate the number of moles of NaCl.
Step 2: Calculate Molar Mass of NaCl
Atomic masses:
Na = 23 g mol⁻¹
Cl = 35.5 g mol⁻¹
Cl = 35.5 g mol⁻¹
Therefore:
Molar Mass of NaCl
= 23 + 35.5
= 58.5 g mol⁻¹
= 23 + 35.5
= 58.5 g mol⁻¹
🎬 NaCl Molar Mass Animation
Na
+
Cl
→
58.5 g mol⁻¹
NaCl contains one Na and one Cl per formula unit.
Step 3: Use the Mole Formula
The formula for calculating moles is:
Moles = Mass ÷ Molar Mass
Step 4: Substitute the Values
Moles of NaCl
= 5.85 ÷ 58.5
= 0.10 mol
= 5.85 ÷ 58.5
= 0.10 mol
🎬 Calculation Animation
5.85 g NaCl
÷
58.5 g mol⁻¹
→
0.10 mol
The given mass is divided by the molar mass to obtain the number of moles.
✅ Final Answer
Number of moles of NaCl = 0.10 mol
Therefore, 5.85 g of NaCl contains 0.10 mole of NaCl.
🎯 Quick Formula
n = m / M
n = 5.85 / 58.5
n = 0.10 mol
n = 5.85 / 58.5
n = 0.10 mol
