How to Understand Stoichometry
Tammy Duong
What is Stoichometry?
Let's Start with the Basics
It's a Double Replacement type of reaction. Remember to switch metal with metal OR non-metal with non-metal.
Keep the equation balanced on both sides, don't forget the charges and include the states of matter! (States of matter should be either aq, s, or l)
Balanced Equation (with states of matter):
Fe (SO4) aq + Ba (NO3)2 aq -----> Fe (NO3)2 aq + Ba (SO)4 s
Get to Know the Elements
Iron (II) Sulfate
- Molar Mass: 151.907 g/mole
Barium Nitrate
- Molar Mass: 261. 336 g/mole
Iron (II) Nitrate
- Molar Mass: 179.835 g/mole
Time for CONVERSIONS!
Let's Talk about Conversions and How To Do It
Okay, so conversions with two different elements... It seems difficult but it's not. Keep in mind what you are solving for, the units, and of course the mole ratio.
Now how to do it, well you've already learned how to do mole to mole conversion which is simple enough. Given an amount of moles from the question, you use the coefficients of your balanced equation and place it in the right spot. Multiply across the top and divide by the bottom. If you don't remember there'll be a visual example below. So that's mole to mole but then there's mass to mass conversion. This process is much longer but it's actually simple. Explaining it in words will just confuse everyone so look at the picture!