Case I Moles
What is Avogadro's Number?
6.022 x 1023
What is the formula for finding moles using molar mass.
Moles= Mass/Molar Mass
This type of reaction consists of two reactants that combine to form one product
Synthesis Reaction
What are the products in this situation?
C6H12O6(s) + 9O2(g) → 6CO2(g) + 6H2O(l)
Carbon dioxide and water
What is Stoichiometry
is the study of the quantitative relationships or ratios between two or more substances undergoing a physical change or chemical change (chemical reaction).
Eric has 4 moles of Element X. How many particles of X are contained within 4 moles?
2.4088 X 1024 particles of X
What is the formula of compound in which 10g of Ca combines with 3g Carbon and 12g of oxygen
CaCO3
This is an example of what type of reaction
SeCl6 + O2 → SeO2 + 3Cl2
Single Displacement
Balance the equation
___ Si + ___ NaOH ___ --> Na4SiO4 + ___ H2
Balance the equation
1 Si + 4 NaOH 1 Na4SiO4 + 2 H2
N2 + H2 --> NH3
If the experimentor has 18 moles of H2, What is the amount of nitrogen needed to fully react with this amount of hydrogen6 moles N2
Use Avogadro's Constant to calculate the number of chloride ions in 3.5 moles of MgCl2
4.2154 x 1024 chloride ions
How many moles of chlorine gas ,Cl2, contain the same number of atoms as there are in 16 g of Helium atoms. Assume the molar mass of helium is 4.00 g/mol. Answer in whole numbers.
2 moles of Chlorine gas contains the same amount of atoms as 16g of He atoms
Solid CaCO3 is heated and decomposes. What two products are formed and their state
CaO(s) + CO2 (g)
Balance this reaction
C4H6 (g) + O2 (g) → H2O(g) + CO2 (g)
2C4H6 (g) + 11 O2 (g) → 6H2O(g) + 8CO2 (g)
Magnesium metal is often used in flares and fireworks as a source of white light. When ignited, it undergoes rapid combustion according to the following balanced chemical equation:
2 Mg (s) + O2 (g) → 2 MgO(s)
Determine the moles of magnesium oxide produced by the reaction of 55.2 g of magnesium metal.
2.271137626 mol MgO or 2.271 mol MgO
If the number of particles in one mole is 6.022 x 1023 , how many oxygen molecules (O2), are there in 1.6 g of oxygen gas?
6.022 x 1022
Calculate the whole number percentage of Nitrogen in the following compounds used as fertilizers: a) NH3 and b) CaCN2
a) 82%
b) 35%
Finish this synthesis equation : O(g) + O2 (g) →
O3 (g)
Balance the following equation
___ Cu + ___ HNO3 --> ___ Cu(NO3)2 + ___ NO + ___ H2O
3 Cu + 8 HNO3 --> 3 Cu(NO3)2 + 2 NO + 4 H2O
In the reaction below, 2.34 g I2O5 reacts with 3.40 g CO. (8 marks; 2 marks each)
I2O5 + 5CO → 5 CO2 + I2
What is the limiting reactant and excess reactant?
LR:I2O5
ER: CO
Use Avogadro's constant to figure out how many oxygen atoms are contained within one mole of blue copper (II) sulphate CuSO4.5H2O
5.4198 x 1024 atoms of oxygen
PhenylMagnesium Bromide is used as a catalyst in organic synthesis. Determine its empirical and molecular formula if the molar mass is 181.313 g/mol and it has the following composition 39.7458% C, 2.77956% H, 13.4050% Mg, and 44.0697% Br.
EF: C6H5MgBr
MF:C6H5MgBr
Finish and balance this equation:___Na3PO4(aq) + __AgNO3 (aq) →
___Na3PO4(aq) + 3AgNO3 (aq) → Ag3PO4 (s) + 3NaNO3 (aq)
Complete the following equation, add state symbols and balance: Silicon dioxide solid plus aqueous hydrofluoric acid (HF) yields solid silicon tetrafluoride plus liquid water
SiO2(s) + 4HF(aq) SiF4(s) + 2H2O(l)
Consider the following reaction:
3 Si + 2 N2 → Si3N4
When 21.44 moles of Si reacts with 17.62 moles of N2, a) how many moles of Si3N4 are formed? b) For the reactant in excess, how many moles are left over at the end of the reaction?
a) 7.147 mol Si3N4
b) 3.33 mol N2