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‫كلية المجتمع بحفرالباطن‬
HAFR AL-BATIN COMMUNITY COLLEGE
Second Semester 2011/2012 (112)
)112( 2012/2011 ‫الفصل الدراسي الثاني‬
LabQuiz 4
Name:________________________________________ID:_________________ Sec:_________
1. The mass of a crucible and a hydrated salt was found to be 21.447g. The mass of the
crucible and the anhydrous salt was 20.070g. The mass of the crucible was 17.985g.
a) Calculate the mass of water lost from the hydrated salt during heating.
Mass of hydrated salt = (21.447 - 17.985) = 3.462g
Mass of anhydrous salt = (20.070 - 17.985) = 2.085g
Therefore, the mass of the water lost through heating is:
3.462 - 2.085 = 1.377g was lost during heating (water in the hydrated salt)
b) Calculate the percent by mass of water in the hydrated salt.