پانی کے 1 تل کے بڑے پیمانے پر _____ کے برابر ہے؟
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A. 18g
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B. 20g
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C. 16g
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D. None of these
Explanation
The molar mass of water (H₂O) is 18 grams per mole (H = 1g × 2, O = 16g).
So, 1 mole of water weighs 18 grams.
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A. 0.25
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B. 0.5
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C. 0.75
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D. 1
Explanation
Each mole of CO₂ contains 2 atoms of oxygen, which is 2 × 16 = 32 g of oxygen.
So, if 32 g of oxygen is in 1 mole of CO₂, then:
16 g of oxygen = 16 / 32 = 0.5 moles of CO₂
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A. 100 moles of bonds
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B. 100 moles of electrons
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C. 40 moles of hydrogen bonds
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D. 30 atoms
Explanation
Each molecule of water (H₂O) has 10 electrons (2 from hydrogen and 8 from oxygen).
Therefore, 1 mole of water has 10 moles of electrons.
So, 10 moles of water have 10 x 10 = 100 moles of electrons.
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A. None of these
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B. 0.25
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C. 0.50
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D. 1.50
Explanation
Step 1: Calculate moles of oxygen8.0 g O / 16 g/mol = 0.5 mol O
Step 2: Calculate moles of CO₂
Since CO₂ has 2 O atoms, moles of CO₂ = 0.5 mol O / 2 = 0.25 mol CO₂
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A. 2.8 g
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B. 1.4 g
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C. 14 g
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D. 28 g
Explanation
At STP, 1 mole of any gas occupies 22.4 dm³.
If 11.2 dm³ = 0.5 mole →
0.5 mole of nitrogen (N₂) = 14 g
→ Full mole = 28 g (molecular mass of N₂)
ایک عنصر میں مولز کی تعداد _____ کے براہ راست متناسب ہے؟
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A. Formula mass
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B. Molar mass of an element
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C. Empirical formula mass
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D. Mass of an element
Explanation
The number of moles is directly proportional to the mass of an element.
It is calculated by dividing the mass of the element by its molar mass.
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