Stoichiometry I
Super Stoichiometry Question (600)
Limiting or Excess?
Miscellaneous Chemistry
Impossible Miscellaneous
100

2H2 + O2 -> 2H2O

Moles of water produced from 5 moles of oxygen gas

10 moles of water

(5 mol O2) * (2 mol H2O/1 mol O2)

100

2H2 + O2 -> 2H2O

The limiting reagent if I have 2 moles of hydrogen gas and 2 moles of oxygen gas

Hydrogen gas

100

an ionic compound is always formed between a _____ and a _____

metal and nonmetal

100

this planet was discovered by William Herschel in 1781; it is also the third largest in our solar system

Uranus

200

2NH3 + H2SO4 -> (NH4)2SO4

The moles of sulfuric acid needed to fully react with 6 moles of ammonia

3 moles of sulfuric acid

2 moles of NH3 in reaction for every 1 mole of sulfuric acid, so 2:1 = 6:3

200

2H2 + O2 -> 2H2O

The limiting reagent if I have 3.1415 moles of hydrogen gas and 41.6 grams of oxygen gas

Oxygen gas

41.6 grams O2 = 1.3 moles

200

The group 16 or 6a elements are known as this

chalcogens

200

this type of tree leaf makes up the majority of the koala diet

eucalyptus

300

2H2 + O2 -> 2H2O

Grams of water produced from 3.1415 moles of oxygen gas

113.22 grams of water

(3.1415 moles O2) * (2 moles water/1 mole O2) * (18.02 grams water/1 mole water)

300

Fe + NaBr -> FeBr3 + Na

The above equation is unbalanced. The excess reagent given I have 250 grams of iron and 100 grams of sodium bromide

Fe + 3NaBr -> FeBr3 + 3Na

(250 grams Fe)*(1 mol Fe/55.845 g Fe)*(3 mol Na/1 mol Fe) = 13.43 moles of Na

(100 grams NaBr)*(1 mol NaBr/102.890 grams NaBr)*(3 mol Na/1 mol NaBr) = 2.92 moles of Na

Iron is the excess reagent

300

Every diatomic gas element

HONClBrIF

BrINClHOF

All appear in gaseous form as 2 (e.g. O2, H2, Br2...)

300

the medical term for bad breath

halitosis

400

2H2 + O2 -> 2H2O

Grams of water produced from 3.1415 grams of oxygen gas

3.5382 grams of water

(3.1415 grams O2) * (1 mol O2/32.0 grams O2) * (2 mol H2O/1 mol O2) * (18.02 grams H2O/1 mol H2O)

400
The name of this compound:

WC

Tungsten Carbide

400

this pitcher recorded the most wins in a single season

Charles "Old Hoss" Radbourn
500

2H2 + O2 -> 2H2O

Molecules of water produced from 2.718 grams of oxygen gas

1.023 x 10^23 molecules of water

(2.718 grams O2)*(1 mol O2/32 grams O2)*(2 moles water/1 mol O2)*(6.022*10^23 atoms/mole)

500

H2SO4 + NaOH -> Na2SO4 + H2O

The above equation is unbalanced. Grams of sodium sulfate produced from 6.245 grams of sulfuric acid

H2SO4 + 2NaOH -> Na2SO4 + 2H2O

(6.245 grams H2SO4)*(1 mol H2SO4/98.079 grams H2SO4)*(1 mol Na2SO4/1 mol H2SO4)*(142 grams Na2SO4/1 mol Na2SO4)

=9.042 grams of sodium sulfate


500

The amount, in grams, that 1 atomic mass unit (amu) is equal to (give to 2 decimal places)

1 amu = 1.66054 × 10–24 g

500

the science of determining a tree's age by looking at its growth rings

dendrochronology