A branch of chemistry dealing with the relationships of elements in compounds & mass relationships between products & reactants
Schichion – element Metron – to measure Required information: balanced equation
Composition – balancing a formula Reaction – balancing equations Reactants to products
Mole-mole Moles A moles B Mole-mass Moles A moles B mass B Mass-mole Mass A moles A moles B Mass-mass Mass A moles A moles B mass B
Conversion factors that relates the moles of any 2 substances in a chemical reaction Moles are like currency Molar mass – mass in 1 mole of a substance
2Ca + O 2 2CaO Mg + 2HF MgF 2 + H 2
Equation – help us to make predictions Form mole ratios Limitations of equations – doesn’t tell how fast the reaction occurs Ideal conditions – usually STP: at what conditions the most products are produced
Moles of A moles of B Mole ratio conversion factor is needed Moles of A * mole ratio B = moles B A CO 2 + LiOH Li 2 CO 3 + H 2 O Is it balanced? What is the mole ratio?
CO 2 + 2LiOH Li 2 CO 3 + H 2 O Mole ratio 1:2:1:1 How many moles of LiOH are required to react with 20 mol CO 2 ? Start with what you know Mole ratio of LiOH/CO 2
H 2 + O 2 H 2 O With 5 moles of water, how many moles of H 2 would you need? Step 1 – balance the equation Step 2 – what do you know Step 3 – mole ratio of hydrogen:water
Units: mol or gram Conversion factors: mole ratio & molar mass Moles A moles B mass B Moles A * Mole ratio B * molar mass B = A 1 mol B
Photosynthesis CO 2 + H 2 O C 6 H 12 O 6 + O 2 What mass of glucose is produced from 24.0 moles of water? Step 1 – balance Step 2 – mole ratio glucose:water Step 3 – molar mass of glucose
Mass A moles A moles B Mass A * 1 mol A * mole ratio B = MM A A
If 8.00 g SO 2 reacts with C, how many moles of CS 2 are formed? C + SO 2 CS 2 + CO Is it balanced?
Mass A moles A moles B mass B Mass A * 1 mol A * mole ratio B * MM B = MM A A 1 mol B
Sn + HF SnF 2 + H 2 How many grams of tin fluoride are produced from the reaction of 15.00g HF with Sn?