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The number of oxygen atoms in 4.4 g of CO2 is approximately

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Important Questions on Some Basic Concepts of Chemistry

EASY
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The number of atoms in 0.1 mole of a triatomic gas is (NA= 6.02 × 1023 mol-1):
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The number of moles of oxygen in 1 L of air containing 21% oxygen by volume in standard conditions is_______
HARD
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1 mL of water contains 20 drops. Then number of molecules of water in a drop will be:
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How many moles of lead (II) chloride will be formed from a reaction between 6.5 g of PbO and 3.2 g of HCl ?Given: Molar mass of PbCl2=278 g/mol, Molar mass of PbO=233 g/mol, Molar mass of HCl =36.5 g/mol