Unformatted text preview: NAMEgSf/HHSﬁ,E ﬁllHEX/Zl CHEM1107(Exp.3-FormA) SCORE 2 *Show ALL work to receive credit for the problem. Answers without calculations shown will
receive ZERO credit. Answers without proper units will have partial credit deducted. 2Al(s) + 2KOH(aq) +4H2SO4(aq) + 22H20(l) —+ 2KAl(SO4)2°12H20(s) + 3H2(g)
~ (alum) 1. (2 pts) How many moles of alum can be prepared from 2.85 g of aluminum (MM = 26.98
g/mol)? (see the equation above) 2. (2 pts) According to the equations about, what minimum volume (in mL) of 2.25 M KOH
would be needed to react with 1.10 grams of Al? ,, $0403 KOH . x—xﬂlé ,
3. (2 pts) What ﬂammable gas is released during the synthesis of alum?
4. (2 pts) What is the percent yield of alum in a reaction where 74.9 g of alum was obtained with a calculated theoretical yield of 88.9 g?
L ,fﬂ' 44.016 : _ ’ o
my IOO [3125 /o) 5. (2 pts) How many moles H2804 are found in a 25.0 mL sample of 9.0 M H2804? See W?! ...
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- Spring '07