Chapter 10 Test Review

(Reg)

Name: ____________________________

1) What is a mole? This exact question will be on your test!! 6.022 x 1023 particles (typically atoms, molecules, or formula units), known as Avogadro’s number 2) What is the mass of one mole of CO2? _______44.01 g__________ 3) What is the molar mass of Cu3(PO4)2 ? _______380.59g_____ 4) What is the empirical formula of: a) C3O6H12 __CO2H4__ c) C8O4H6 __C4O2H3___

b) N4O10 ____N2O5___ d) C4H7 _____C4H7________

5) Convert 47.5 L of NO2 at STP to moles. 2.12 mol

6) Convert 3.2 x 1023 atoms helium gas to liters at STP. 11.90 L

7) Convert 720g of Al2(SO4)3 to formula units. 1.27 x 1024 formula units

8) How many moles are in 5.32 x 1024 molecules of CH4? 8.83 mol

9) How many atoms are present in 345g Be(NO3)2? 1.56 x 1024 atoms

10) What is the molecular formula of a compound that has a mass of 731.6 and an empirical formula of Cl2O7? Cl8O28 11) A compound has the empirical formula CH4. Its mass is 96g. What is its molecular formula? C6H24

12) What is the molecular formula of a substance that has an empirical formula of C2H5 and a molecular mass of 58 g/mol? C4H10

13) Find the percent composition of each element in Al(NO3)3. %Al = 12.67 % %N = 19.73 % % O = 67.60 %

14) Find the percent composition of each element in K2SO4. %K = 44.88 % %S = 18.40 % % O = 36.73 %

15) What is the percentage of aluminum in aluminum oxide? (Al2O3) %Al = 52.92%

16) What is the molecular formula of a compound that has a molar mass of 86g and is 83.721% carbon and 16.279% hydrogen? A) C5H26 B) C6H14 C) C2H4 D) C5OH10 17) A compound contains 38.8% Cl and 61.2% O. What is the empirical formula? A) ClO B) Cl2O7 C) Cl4O6 D) C2H7 18) A compound is composed of 40% carbon, 6.67% hydrogen, and 53.3% oxygen, and the molar mass is 60g. What is the molecular formula for the compound? A) CH2O B) C2H4O2 C) CHO D) C3H8O 19) A compound is 30.4% nitrogen and 69.6% oxygen. What is the empirical formula? A) N2O4 B) NO2 20) How many particles are in one mole of anything? ____6.022 x 1023______ 21) How many liters are in 1 mole of any gas? ____22.4______ 22) What does “STP” stand for? ________standard temperature & pressure________ 23) What do 6.022 x 1023 molecules and 22.4 L at STP all have in common? ____________________They are all equivalent to one mole.________________________