| pls help, chemistry helper?
The value of the acid-dissociation constant, Ka for a weak monoprotic acid HA is 2.5 x 10^6. The pH of 0.40 HA is closet to
a) 2.0
b) 3.0
c) 4.0
d) 6.0
e) 8.0
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After 195 days, a 10.0 sample of pure 95Zr (95 is above as a proton of Zr) has decayed to the extend that only 1.25g of the original 95Zr remains. The half-lfe of 95Zr is the closet to
a) 195 days
b) 97.5 days
c) 65.0 days
d) 48.8 days
e) 24.4 days
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Which of the following would produce the LEAST mass of CO2 if completely burned in excess oxygen gas?
a) 10.0g CH4
B) 10.0g CH3OH
C) 10.0g C2H4
d) 10.0g C2H6
e) 10.0g C4H5OH | 
Linear Mode
