Multiple ChoiceIf a sample of water contains 12 × 10^{23} oxygen atoms, how many moles of water molecules are present in the sample?35views
Multiple ChoiceIn the context of the mole concept, which statement best describes the role of baking soda (NaHCO_3) in mole calculations?33views
Multiple ChoiceMagnesium and iron are metallic elements. How does a mole of magnesium compare with a mole of iron?27views
Multiple ChoiceHow many moles of cyclohexanone (molar mass = 98 g/mol) are present in a sample containing 147 g of cyclohexanone?42views
Multiple ChoiceHow many moles are present in 22 grams of argon (Ar)? (Atomic mass of Ar = 39.95 g/mol)42views
Multiple ChoiceA solution is prepared by mixing 50.0 g of benzene (C6H6) and 50.0 g of toluene (C7H8) at 25°C. The vapor pressures of pure benzene and pure toluene at this temperature are 95.1 mmHg and 28.4 mmHg, respectively. Assuming ideal behavior, what is the mole fraction of benzene in the vapor above the solution?37views
Multiple ChoiceIn one mole of Be(OH)_2, how many moles of each element (Be, O, and H) are present?35views