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 \times 10^{24} molecules of H_2O. How many moles of water are present?
A sample contains 3.011 \times 10^{23} molecules of CO_2. How many moles of CO_2 are present?
A sample of gas contains 1.204 \times 10^{24} 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 (H_2O).
Calculate the number of moles in 88 g of CO_2. (Molar mass of CO_2 = 44 g/mol)
Calculate the number of oxygen atoms in 1 mole of H_2O.
How many atoms are present in 0.5 mole of helium (He)?
How many atoms are present in 1 mole of methane (\mathrm{CH}_4)?
How many atoms are present in 2 moles of sodium (Na)?
How many molecules are there in 3 moles of ammonia (NH_3)?
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 (H_2O)? (Molar mass = 18 g/mol)
How many moles are present in 4.4 g of CO_2? (Molar mass = 44 g/mol)
If you have 0.1 mole of SO_2, 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 (H_2O), how many moles do you have?
State Avogadro's hypothesis.
What is the value of Avogadro's constant?
