Balancing
When an equation of balanced, both sides of the equation must have the same number of this.
What is atoms?
The gram-formula mass of Fe(NO3)3
What is 242g?
These numbers represent the mole ratio of all substances in a balanced equation.
What are coefficients?
Where you find the equation for percent composition.
(Must point at the exact location on the Reference Tables)
What is Table T, 4th equation from top to bottom?
The empirical formula for H2O.
What is H2O?
The coefficient of H2O when this equation is balanced:
___H2 + ___O2 → ___H2O
What is 2?
2H2 + O2 → 2H2O
The mass of 1.0 mole of a compound with a gram-formula mass is 48 grams.
What is 48g?
2NO + O2 → 2NO2
The mole to mole ratio of NO to O2.
What is 2 to 1?
The percent composition by mass of nitrogen in NH4OH. Show a correct numerical setup on the board.
What is 40%?
14/35 x 100
The empirical formula for glucose, C6H12O6.
What is CH2O?
The coefficient of CuSO4 when this equation is balanced:
___Al + ___CuSO4 → ___Al2(SO4)3 + ___Cu
What is 3?
2Al + 3CuSO4 → Al2(SO4)3 + 3Cu
The mass, in grams, of a 4.2-mole sample of O2.
(Show a correct mathematical setup and answer on the board.)
What is 134.4g?
4.2 mol = mass / 32 g/mol
4Al(s) + 3O2(g) → 2Al2O3(s)
The amount of moles of Al(s) that react with 4.50 moles of O2(g) to produce 3.00 moles of Al2O3(s)?
What is 6 moles of aluminum?
The percent composition by mass of water in KAl(SO4)2•12H2O. Show all work.
What is 45.6%?
216/474 x 100
The molecular formula of a compound that has a molecular mass of 54 and the empirical formula C2H3.
What is C4H6?
The element that is NOT balanced in this equation. Explain.
2Al(s) + 3O2(g) → 2Al2O3(s)
What is Aluminum?
(There should be a 4 on the Al on the left)
The amount of moles of water in a 135 g sample of water. Show your work on the board.
What is 7.5 moles of water?
135g / 18g/mol = 7.5 moles
4Al(s) + 3O2(g) → 2Al2O3(s)
The amount of moles of O2(g) that react with 10 moles of Al(s) ?
Show your work on the board.
4/10 = 3/x
The percent composition by mass of water in CaCl2•2H2O. Show all work on the board.
What is 24%?
36 / 147 x 100
The molecular formula of a compound that has a molecular mass of 56 and the empirical formula CH2. Show your work on the board.
What is C4H8?
56/14 = 4