AP CollegeBoard AP Chemistry
Test Booklet
Unit 9 Review
4.
2X(g) + Y(g) = 3Z(g)
The reaction mixture represented above is at equilibrium at 298 K, and the molar concentrations
are [X] - 2.0 M. [= 0.5 M, and [2] = 4.0 M. What is the value of the equilibrium constant for the
reaction at 298 K ?
0.50
2.0
4.0
16
32

organisms are more likely to be more preserved in mud than sand because mud is moist and wet, while sand is very dry.

metric time was an attempt to create a standard unit of time based off of 10, but it never took off an is not included in the metric system (si)

answer is: empirical formula is tl₂o. if we use 100 grams of compound, tha:

m(tl) = 96.2%  · 100 g ÷ 100%.

m(tl) = 96.2 g.

n(tl) = m(tl)  ÷ m(tl). n(tl) = 96.2 g  ÷ 204.4 g/mol.

n(tl) = 0.47 mol. m(o) = 3.77 g. n(o) = m(o)  ÷ m(o). n(o) = 3.77 g  ÷ 16 g/mol. n(ag) = 0.235 mol. n(tl) . n(o) = 0.47 mol : 0.235 mol /0.235. n(tl) . n(o) = 2 : 1.

m(tl₂o) = 204.4 g/mol  · 2 + 16 g/mol = 424.8 g/mol.

m(compound) = 456. 8 g/mol - 424.8 g/mol = 32 g/mol ( 2 oxygens); tl₂o₃.