Balancing an equation
SnO2 + H2 → Sn + H2O
Finding GFW
To find the GFW you add up the atomic weight of each element in a compound, if there is a number in subscript on the element you multiply that times the atomic weight (rounded to the nearest whole number, other than Chlorine which is 35.5) and then add it to the atomic weight of the other elements.
H4ClO3
H=1
Cl=35.5
O=16
(1 X 4) + 35.5 + (16 X 3)=87.5=GFW
Finding the number of Moles if given grams or particles
To find the number of moles if given grams you must find the GFW as shown above, and divide the number of grams by it to find the moles.
Moles=Grams/GFW
To find the number of moles if given particles you divide the number of particles by approximately 6 X 10e23 which is the number of particles in one mole of any substance.
Moles=particles/6 X 10e23
SnO2 + H2 → Sn + H2O
- List the number of each chemical present on each side of the equation (First side: 2 H, 2 O, 1 Sn) (Second side: 2 H, 1 O, 1 Sn)
- Since there is only one hydrogen on the right side and two on the left this equation is not balanced.
- You can add coefficients to any terms as to make both sides equivalent.
- The first step would be to add whatever coefficient balances out what is not equal on the other side (Add a 2 to H2O), but as the coefficient extends to every part of the term that may put other elements (H) out of balance.
- You must keep adding coefficients until eventually both sides have an equal number of each element on each side of the equations. (Add a 2 to H2)
- The final balanced equation would look like: SnO2+2H2
→ Sn + 2H2O
Finding GFW
To find the GFW you add up the atomic weight of each element in a compound, if there is a number in subscript on the element you multiply that times the atomic weight (rounded to the nearest whole number, other than Chlorine which is 35.5) and then add it to the atomic weight of the other elements.
H4ClO3
H=1
Cl=35.5
O=16
(1 X 4) + 35.5 + (16 X 3)=87.5=GFW
Finding the number of Moles if given grams or particles
To find the number of moles if given grams you must find the GFW as shown above, and divide the number of grams by it to find the moles.
Moles=Grams/GFW
To find the number of moles if given particles you divide the number of particles by approximately 6 X 10e23 which is the number of particles in one mole of any substance.
Moles=particles/6 X 10e23