Post-Lab Questions L A was in a hurry and decided to take a shortcut in the rroc
ID: 816148 • Letter: P
Question
Post-Lab Questions L A was in a hurry and decided to take a shortcut in the rrocedure. After washing and drying the crucible with towels, the student did not do steps 2, 3, and 4 in the introd but immediately went to step 5 and continued from there. What is the error that will be into the experiment? 2. If your sample contained a volatile impurity, what value would be in error, the mass of the anhydrous salt or the mass of the water? Explain your answer. 3, Below are the formulas of some hydrates. What is the mole ratio of salt to water? Water Hydrate Salt Caso 2Hro A student worked with a sample of Znso, 7H2O. a. How many atoms of each kind are present? b, What is the stoichiometric ratio of salt to water? c Calculate the percent of water in the hydrate. Show your work.Explanation / Answer
4
a)Zn - 1
S - 1
O - 4 + 7 = 11
H - 7 x 2 = 14
b) 1 : 7
c) total mass water = 7 x molar mass of H2O=7*18=126 g
molar mass of compound =161
126/(126+161)*100=43.9%