What is the value of one mole?
6.022 x 1023 particles
N2 + 3H2 -> 2 NH3
If you start with 1.00 moles of N2, how many moles of NH3 form?
2.00 moles
Who was Avagadro?
Italian scientists who estimated the value of the mole
What's 2.5 moles of NaCl in formula units?
Na = 22.99 g/mole
Cl = 35.45 g/mole
What is the molar mass of 3 NH3? (ammonia) (must have correct units)
N = 14.01
H = 1.01 * 3
= 3 (14.01 + 3.01) = 51.12 g/mole
2H2 + O2 -> 2H2O
How many grams of water form from 4.00 g H2?
Use H = 1.02 g/moles
4.00g * (1mole H2 /2.02 g ) * (2 moles H2O / 2 moles H2) * (18.02 g / 1 mole H2O) = 35.68 grams of water
6:02AM to 6:02 PM
If you have 18.02 g of H2O, how many moles do you have?
1 mole
If you have 3 moles of O2, how many molecules do you have?
3 moles * (Avagadro's number / 1 mole) = 1.81 x 10^24
How many grams of NaCl form from 46g of Na? (Round to the nearest whole number)
Na = 22.99 g/mole
Cl = 35.45 g/mole
46g Na * (1 mol Na /22.99 g Na) * (2 moles NaCl / 2 moles Na) * ( 58.44 g / 1 mole Na ) = 117 g NaCl
What law states that equal volumes of gases at the same temperature and pressure contain equal number of particles?
Avagadro's Law
How many grams are in 0.25 moles of CO2?
CO2 = 44.01g/mole
.25 mole CO2 * (44.01 g / 1 mole) = 11 g
How many moles are in 24g of carbon? (carbon = 12g/mole)
24 g * (1 mole/12 g) = 2 moles
C3H8 + 5O2 -> 3CO2 + 4H2O
If you start with 22 g of propane, how many grams of CO2 are produced?
C = 12.01 g/mole
H = 1.01 g/mole
O = 16 g / mole
22 g propane * (1 mole propane / 44.11 g propane) * (3 moles CO2 / 1 mole propane) * (44.01 g CO2 / 1 mole CO2) = 66 g CO2
What century was the number estimated in?
19th
How many molecules are in 0.5 moles of NaOH?
Na = 22.99 g/mole
O = 16g/mole
H = 1.02 g/mole
.5 moles NaOH * (Avagadro's number/1 mole) = 3.011 x 10^23
True or false: one mole of copper has the same mass as one mole of gold
False
CH4 + 2O2 -> CO2 + 2H2O
How many grams of CO2 are produced when 10g of CH4 burns completely?
C= 12.01
O = 16
H = 1.01
10g CH4 * (1 mole CH4 / 16.05 grams) * (1 moel CO2 / 1 mole CH4) * (44.01 grams CO2 / mole) = 27.5 g CO2
What was Avagadro's previous profession before he became a physicist?
Lawyer
How many grams are in 2.67 x 1012 formula units of Tungsten?
W = 183.84 g/mole