2. Which of the following is NOT the correct chemical formula for
the compound named?
(a)hydrocyanic acid HCN (b)calcium sulfate CaSo4
(c)beryllium oxide BeO (d)nickel(Ⅱ) peroxide Ni2()
(e)ammonium chromate (NH4)2CrO4
4. Balance the reaction below in acidic solution
IO3- + I → I2
What volume of 0.352M HCL is needed to produce 2.48*10^-3
moles of iodine , I2, with an excess of KIO3 and KI?
(a)2.48ml (b)4.96ml (c)7.05ml (d)14.1ml (e)none of these
5. Which of the following relations is correct?
(a)H=E-PV (b)H=G-TS (c)for a irreversible change dS2 < dq/T
(d)for a reversible change dS1=dH(sys)
(e)for and irrversible change △S1 + △S2 = 0
(f)at the phase transition △S1 = △H/T
※ S1 = S(sys) S2 = S(surr)
6. Oxygen gas. generated by the reaction2KClO3(S) → 2KCl(S)+3O2(g).
is collected over water at 27 C in a 2.00-l. vessel at a total
pressure of 760. torr.(The vapor pressure of H2O at 27 C is 26.0torr.)
How many moles of KClO3 were consumed in the reaction ?
(a)0.0790moles (b)0.119moles (c)0.0527moles
(d)0.0813moles (e)none of these
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