Chemical Quantities

balancing equations

100

the coefficientes of the reaction between sodium and chlorine gas to produce sodium chloride are:

2,1,2

200

the coefficients for the decomposition of potassium chlorate are 

2,2,3

300

the coefficients for silver nitrate and magnesium chloride forming silver chloride and magnesium nitrate 

2,1,2,1

400

coefficients of the reaction between potassium and magnesium bromide producing potassium bromide and magnesium

2,1,2,1

500

coefficients of carbon dioxide and water producing glucose (C₆H₁₂O₆) and oxygen gas (O₂)

6,6,1,6

empirical formula

100

empirical formula of water

H2O

200

empirical formula for C6H6CH₃

C6H6CH₃

300

molecular formula of CH₃  with a molar  mass of 75 g/mol

C₅H₁₅

400

empirical formula of a compound with 94.1% O and 5.9% H

OH

500

the compound methyl butanoate has a composition of 5.5% C, 9.8% H and 31.4% O. If its gram molecular mass is 102 g/mole, what is its molecular formula?

C₅^H₁₀O₂

molar mass Avogadro's number calc, moles, volume

100

what is Avogadro's number

6.02 x 10²³

200

the molar mass of calcium carbonate is 

100.00 grams/mole

300

how many liters  are occupied by 3 moles of  nitrogen gas (N₂) at STP? 

67.2 L

400

how many molecules of sulfur dioxide  are present in 50. grams of sulfur dioxide? 

6.27 x 10²³

500

How many oxygen atoms are present in 10. grams of nitrogen dioxide?

2.6 x 10²³ atoms of oxygen

solutions(percent by mass, by volume

100

the percent by volume of hydrogen peroxide is

3.0% 

200

what is the formula to calculate percent by mass?

grams of solute/grams of solution x 100

300

calculate the percent by mass of 3 grams of sodium chloride in 100 mL of water (density of water is 1.0 g/mL)

2.91%

400

how many grams of sodium chloride are needed to prepare 50. grams of a sodium chloride solution of 4.5%? 

2.25 grams of sodium chloride

500

how many grams of the solvent are need to prepare a solution of 5.0%, if you have 2.0 grams of sodium chloride?

38 grams of the solvent

molarity and dilution

100

what are the units of molarity? what is the symbol for molarity

moles per liter, M

200

what is the name of the glassware used to prepare a solution of a known concentration?

volumetric flask

300

what is the molarity of solution consisting of the dissolution of 3.0 moles of potassium oxide in 500.  mls of water?

6.0 M

400

determine the volume in mLs needed for  a solution of 5.o grams of diphosphorus pentoxide and a molarity of  3.0 M.

12 mls.

500

How many grams of sodium hydroxide are necessary to prepare 200. mls of 0.5 M of NaOH?

4 grams of sodium hydroxide