Mole Concept: formulas aur numericals Roman Urdu mein

Likhne wali: Javeria Maqsood, Rehnuma · Aakhri update: 2 November 2026

Mole concept Chemistry ka sab se zaroori topic hai kyunke stoichiometry aur zyadatar numericals isi par chalte hain. Is guide mein ek hi tareeqa seekhein aur har numerical hal karein.

Mole kya hota hai

Ek mole kisi cheez ke utne zarrat (atoms, molecules ya ions) ko kehte hain jitne 12 g carbon-12 mein atoms hote hain. Ye tadad Avogadro number hai:

NA = 6.022 × 10²³ per mole

Teen kaam ke formulas

Moles = Mass (g) ÷ Molar mass (g/mol)
Number of particles = Moles × 6.022 × 10²³
Gas ka volume (STP par) = Moles × 22.4 dm³

Kuch kitabon mein room temperature par 24 dm³ bhi use hota hai, is liye apni kitab ya board ke mutabiq check karein.

Hal kiye hue numericals

1) 18 g paani mein kitne molecules hain?
Molar mass H₂O = 2(1) + 16 = 18 g/mol. Moles = 18 ÷ 18 = 1 mol. Molecules = 1 × 6.022 × 10²³ = 6.022 × 10²³.

2) 11 g CO₂ ke kitne moles hain?
Molar mass CO₂ = 12 + 2(16) = 44 g/mol. Moles = 11 ÷ 44 = 0.25 mol.

3) 2 mol oxygen gas STP par kitni jagah lega?
Volume = 2 × 22.4 = 44.8 dm³.

Har numerical ke liye 4 qadam

Jo diya hai (given) likhein.
Molar mass nikalein (periodic table se atomic masses jama karein).
Sahi formula chunein: mass, particles ya volume.
Unit ke sath jawab likhein.

Rehnuma se ye sawal poochein

“Mole concept ka formula samjhao”
“Mera numerical step by step hal karo”
“Molar mass nikalne ki practice karao”

Rehnuma kholein: 3 din free

Is topic mein mazeed madad ke liye Chemistry ka page dekhein.

Aksar poochhe jane wale sawal

Avogadro number kitna hota hai?

6.022 × 10²³ per mole.

Molar mass kaise nikalte hain?

Formula mein har atom ka atomic mass us ki tadad se zarb kar ke jama kar lein, jaise H₂O = 2(1) + 16 = 18 g/mol.