Academic Chemistry Unit 5 Test Review: Due 11/12staff.katyisd.org/sites/khschem/Chemistry Documents/Unit... · 2014-11-13 · Academic Chemistry Unit 5 Test Review: Due 11/12, Chemical
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Academic Chemistry Unit 5 Test Review: Due 11/12, Chemical Quantities & The Mole TEST on 11/13
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Problems:
correct units and significant figures.For the following Problems, show aH work and report your answers with the
1. What is the molar mass ofBaC03? <'ÿ> 6ÿ - ( 2ÿ i ÿ '7 " "ÿ Zÿ
2. In one molecule of Pz05, how many phosphorous atoms are present?
16. Find the empirical formula for the following substances (a. and b.) using the information given:a. A compound is composed of 38.67% potassium, 13.85% nitrogen, 47.48% oxygen. What is the
empirical formula?
bnm ¢
• ÿ, OO Iÿ vÿ
)
i ÿiSI
1%
0
b. A compound is made up of 44.33% phosphorus and 57.18% oxygen- what is the empirical
formula?
/17. Determine the molecular formula for each of these compounds.
a. empirical formula = CH20; the molar mass = 90 g/tool ,,.ÿ
12,o1ÿ
empirical formula = HgCI; moÿ-'ÿr,ÿss = 472.2 g/tool ÿ
18. The action of bacteria on meat and fish produces a poisonous compound callersname and origin imply, it stinks! It is 58.77% C, 13.81% H, and the remainder is Nitrogen. Its molarmass is 102.2 g/tool. Find its empirical and molecular formula. (Hint: Find the empirical formula