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Academic Chemistry Unit 5 Test Review: Due 11/12, Chemical Quantities & The Mole TEST on 11/13
,. f-'
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?
:/5'7.32ÿiÿootl
. List all seven diatomics: ÿ - ÿ-ÿ
© ÿa ÿt ÿ<ÿ "ÿ.
4.
.
Calculate the percent composition of Ca(OH)z.
>€
Calculate the percent composition of ,, ydride. ÿ-ÿ 2--ÿ (,ÿ
6, How many atoms of carbon are in 3.6 moles of
q, 61,-'ÿ177',ÿ1oo
s? % C_ÿ (!S°to 01}
t_=
,
.
Determine the number of moles of hydrogen that are in 362.8 g of this elemen .
i! N. gtc;+.O Ida.A chemical reaction produces 13.8 tool of carbon monoxide gas. What volume will the gas occupy at STP?
_0 = ÿct I;;2 = o
. What is the mass of 5.0 X 1025. :ormula units of Fe(NOz)3?
10. HAw many liters are there in 5.25 g COÿ at STP?
I "'l"ÿ ÿ--Lÿ-" "ÿ, .-J--ÿ-AL ..... r-
11. How many Grams of Ne are here in 5.5 moles of the gas?
12. Nomenclature Review
Name the following compounds Write the formulas for the following compounds.
(NH4)=CO3 Q.ÿIÿ9ÿ'ÿ Ctiÿ- Odÿrboÿc{Jrÿd.
a. dinitrogen tetroxide ÿ 2-ÿ0Llr
b. copper(I)sulfide CLÿ,ÿ,.ÿ
c. calcium nitrate Cÿ 0ÿ 2_
d. strontium bromide
e. gold(II) phosphate
f. Ni(OH)2 Iÿ'iÿ (ÿ') h(ÿ(ÿ(ÿiÿ2ÿO-b f. pe_pÿent_ntaphosphorusdecoxide
13. Theterm STÿ means: ÿÿanÿ-ÿ TÿmpkrlHÿ ÿc-ÿcÿu¢ÿ-_ _ ÿ WhiCh means:
14. Define empirical formula.
15. Define molecular formula.
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
Iÿ_-- 200 .ÿq ,ÿ ÿ -- ÿ.eÿ 0diÿF-- qq2.ÿ _ ÿ o ooÿr._-ÿU_./
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
L ---------o I l a.oll cOG