a. How many hydrogen and oxygen atoms are present in 1 molecule of H2O?
b. How many moles of hydrogen and oxygen atoms are present in 1 mol H2O?
c. What are the masses of hydrogen and oxygen in 1.0 mol H2O?
d. What is the mass of 1.0 mol H2O?
Part 2:
Two hypothetical ionic compounds are discovered with the chemical formulas XCl2 and YCl2, where X and Y represent symbols of the imaginary elements. Chemical analysis of the two compounds reveals that 0.25 mol XCl2 has a mass of 100.0 g and 0.50 mol YCl2 has a mass of 125.0 g.
a. What are the molar masses of XCl2 and YCl2?
b. If you had 1.0-mol samples of XCl2 and YCl2, how would the number of chloride ions compare?
c. If you had 1.0-mol samples of XCl2 and YCl2, how would the masses of elements X and Y compare?
d. What is the mass of chloride ions present in 1.0 mol XCl2 and 1.0 mol YCl2?
e. What are the molar masses of elements X and Y?
f. How many moles of X ions and chloride ions would be present in a 200.0-g sample of XCl2?
g. How many grams of Y ions would be present in a 250.0-g sample of YCl2?
h. What would be the molar mass of the compound YBr3?
Part 3: A minute sample of AlCl3 is analyzed for chlorine. The analysis reveals that there are 12 chloride ions present in the sample. How many aluminum ions must be present in the sample?
a. What is the total mass of AlCl3 in this sample?
b. How many moles of AlCl3 are in this sample?