CHML 142 SPRING 2017 Jackson State University Department of chemistry and Bioche
ID: 493423 • Letter: C
Question
CHML 142 SPRING 2017 Jackson State University Department of chemistry and Biochemistry GENERAL CHEMISTRY LABORATORY: PART Instructor: Wojciech Kolodziejczyk student Eduard LAhite MIDTERMEXAMINATION ararty show your work eekulations and Realanswer furthefenowing problems. No a edes war De given ner multiple onswers Graphing Technics and Math Skills 1. Solve the following equation for (5 points) 2x2 2-3x 2. Find K in a following equation: (5 points) INH. if INHal 2.0 x 10-3, IN m 1.00 x 10-2, H2]-0.002. Use the proper number of significant figures.Explanation / Answer
Q1.
solve 2x^2 = 2-3x
equality must be = 0
so
2x^2 +3x - 2 = 0
use quadratic equation
x = -b+/-sqrt(b^2 -4ac) / 2a
x = -3+sqrt(3^2^-4*2*(-3)) / 2(2) ; x = -3-sqrt(3^2^-4*2*(-3)) / 2(2)
x = 0.5 and -2
Q2.
for
K = [NH3]^2 / ([N2][H2]^3)
substitute values
K = (2*10^-3)^2 / (10^-2)(0.002^3)) =3.2*10^-12
sig fig --> 1 , since 0.002 has only 1 sig fig --> 3*10^-12
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