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39 Given the balanc
35 What is the percent composition by mass of sulfur in the compound MgSO4 (gram-formula mass = 120. grams per mole)?
(1) 20.% (2) 27%
reaction:
Zn(s) + H SO 2 4
Which type of re equation?
(1) decomposition (2) double replac
In a laboratory 22°C, a steel cylin a sample of water flows from
(1) both the air an
(2) both the cylin
(3) the air to the
the cylinder
(4) the cylinder to
(3) 46%
Sample Regents Questions
(4) 53%
36 Which compound becomes less soluble in water as the temperature of the solution is increased?
(1) HCl (3) NaCl (2) KCl (4) NH4Cl
40
P.S./Chem.–June ’11
Choice #1
June 2011 #36
Answer
to the air [5]
That means that it must be a gas.
Explanation:
Look at Reffy, Table G (p. 3). The HCl line shows that the higher the temperature, the lower the solubility.
( a
e
w d
d
277 © UNIT 7: SOLUTIONS / SOLUBILITY
