How many mol CuI()will dissolve in 1.0 L of 0. 10 M NaI solution?
How many mol CuI()will dissolve in 1.0 L of 0. 10 M NaI solution?
How many mol CuI()will dissolve in 1.0 L of 0. 10 M NaI solution?
Dinitrogen pentaoxide, N2O5, is the anhydride of nitric acid. It is not very stable, and in the gas phase or in solution with a nonaqueous solvent it decomposes by a first-order reaction into N2O4and O2. The rate equation is
v=kc(N2O5)
At 45℃, the rate constant for the reaction in carbon tetrachloride is 6.22×10-4s-1. Ifthe initial concentration of the N2O5in the solution is 0.100mol·dm-3, how many minuteswill it take for the concentration to drop to 0.0100 mol·dm-3?
A.for
B. against
C. of
D. with
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A.Four.
B.Three.
C.Two.
D.One.
How many students were shot dead in 1997 in the US schools?
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B.10
C.12
D.22
How many types of regular computers are introduced in this text?
A.1 B.2
C.3 D.4
How many people are on John Timbald's crew?
A.Four.
B.Five.
C.Six.
D.Twelve.
A.How many
B.How much
C.How often
D.How long
The ______ was conducted to find out how many people prefer butter.
A.examination
B.inspection
C.survey
D.analysis
How many countries will ______ in the 2008 Olympic Games?
A.participate
B.play
C.take
D.have