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?

:/5'7.32ÿiÿootl

. List all seven diatomics: ÿ - ÿ-ÿ

© ÿa ÿt ÿ<ÿ "ÿ.

4.

.

Calculate the percent composition of Ca(OH)z.

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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

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