Mole Concept and Avogadro Constant
Chemistry ⇒ Stoichiometry and Chemical Calculations
Mole Concept and Avogadro Constant starts at 9 and continues till grade 12.
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See sample questions for grade 9
A sample contains 1.204 × 1024 molecules of H2O. How many moles of water are present?
A sample contains 3.011 × 1023 molecules of CO2. How many moles of CO2 are present?
A sample of gas contains 1.204 × 1024 molecules. How many moles of gas are present?
Calculate the number of chloride ions in 0.5 mole of NaCl.
Calculate the number of molecules in 0.5 moles of water (H2O).
Calculate the number of moles in 88 g of CO2. (Molar mass of CO2 = 44 g/mol)
Calculate the number of oxygen atoms in 1 mole of H2O.
How many atoms are present in 0.5 mole of helium (He)?
How many atoms are present in 1 mole of methane (CH4)?
How many atoms are present in 2 moles of sodium (Na)?
How many molecules are there in 3 moles of ammonia (NH3)?
How many moles are present in 12 g of carbon (C)? (Atomic mass of C = 12 g/mol)
How many moles are present in 36 g of water (H2O)? (Molar mass = 18 g/mol)
How many moles are present in 4.4 g of CO2? (Molar mass = 44 g/mol)
If you have 0.1 mole of SO2, how many molecules do you have?
If you have 0.25 moles of NaCl, how many formula units do you have?
If you have 18 g of water (H2O), how many moles do you have?
State Avogadro's hypothesis.
What is the value of Avogadro's constant?
