Moles (n) I
How many atoms are in 1 mole ?
1 mole = 6.022 * 1023
What is the equation to calculate moles (n) from grams.
n = Mass (g) / MW
Draw the "map" of stoichiometry conversions
Mass of A -> Mole A -> Mole D -> Mass D
Why is Stoichiometry important to chemistry ?
Stoichiometry is an important concept in Chemistry that helps us use balanced chemical equations to calculate amounts of reactants and products in a reaction. Especially when you need to calculate quantities of different compounds.
What is the most important unit in chemistry ?
moles
How many molecules are in 1 mole of HBr ?
6.022 * 1023 molecules of. HBr
What is the equation to calculate the # of Atoms/Molecules from moles ?
# of Atoms or Mol. = (n) (6.022 * 1023)
If there are 3g of Mg, how many moles of MgO are present ?
2 Mg + O2 -> 2MgO
0.123 moles
If there are 1.5g of Na, how many moles of NaCl are present ?
2 Na + Cl2 -> 2NaCl
0.065 moles of NaCl
What is the Molecular weight of NaBr.
102.894 g/mol
What is the mole ratio between CH4 & HCl
CH4 + 4 Cl2 → CCl4 + 4 HCl
1 : 4
If there are 32g of Silicone (Si) how many moles of Si do I have ?
= 1.139 moles
How many moles are in 3.4 * 1023 molecules of H2SO4
0.56 moles
(3 min)
Calculate the grams of NH3 are present if there is 1 gram of H2 ?
3 H2 + N2 -> 2 NH3
~ 5.67
How many moles of H2O are there in 0.0643 grams of H2O?
= 0.00357 moles
(3 min)
How many grams of NH3 are in 9.41 moles of NH3?
160.26 grams
(3 min)
How many atoms are in 177g of Carbon ?
8.87 * 1024
(3 min)
How many grams of Zn(OH)2 are in 3.67 moles?
= 365 grams
(3 min)
Calculate the grams of SO3 if 3.4 moles of SO2 are present.
2 SO2 + O2 -> 2 SO3
272.204 g
(3 min)
Balance the following reaction
_____Xe + _____F2 → ______XeF6
1,3,1
(3 min)
How many moles of Fe2O3 are present in a flask if there is 2g of Fe2O3
0.0125 moles
(2 min)
How many moles are in 25 grams of water ?
1.38 mols
(3 min)
How many molecules are in 25 grams of NH3
8.9 x 1023 molecules
(5 min)
Calculate the grams of CO2 present if there are 6 grams of O2 ?
C3H8 + 5 O2 -> 3 CO2 + 4 H2O
4.95 g
(3 min)
Balance the following Chemical reaction
_____ NaBr + _____Cl2 → _____ NaCl + _____ Br2
2,1,2,1