Automative antifreeze is a 60% weight/weight aqueous solution of ethylene glycol (C2H6O2) then its molality is?
- 34 moles/kg
- 24.2 moles/kg
- 20 moles/kg
- 28 moles/kg
Explanation
The molar mass of ethylene glycol (C2H6O2) = 2(12.01) + 6(1.01) + 2(16.00) = 62.07 g/mol
Number of moles of ethylene glycol = 60 g / 62.07 g/mol ≈ 0.966 moles
Mass of water = 100 g - 60 g = 40 g
Now, we need to convert the mass of water to kilograms:
Mass of water = 40 g * (1 kg / 1000 g) = 0.04 kg
Now, we can calculate the molality:
Molality (m) = moles of solute / mass of solvent in kg
Molality = 0.966 moles / 0.04 kg ≈ 24.15 moles/kg.
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کاربونیٹڈ پانی کس چیز کا محلول ہے؟
- Water oxidised by carbon at high temper
- Carbon in water under high pressure
- Carbon is oxidised by water under high pressure
- None of these
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کس قسم کے ردِعمل میں کے سی درجہ حرارت کے ساتھ براہِ راست بڑھتا ہے؟
- Neutralization reaction
- Endothermic
- Exothermic
- None of these
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درج ذیل میں سے کون سا تیزابی بفر ہے؟
- HCN+NaCN
- CH3COOH+NH4Cl
- HCl+NaCl
- HCL+NH4Cl
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- Electricity
- Freezer
- O₂
- None of these
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