Classwork 14A – Day 2 Purpose: To practice law of conservation of mass and mole ratio

For each chemical reaction below show that the law of conservation of mass is observed

3 BaF2 + 2 K3PO4 → 1 Ba3(PO4)2 + 6 KF
1 H2SO4 + 1 Mg(NO3)2 → 1 MgSO4 + 2 HNO3
1 WO3 + 3 H2 → W + 3 H2O
3 O2 + CS2 → CO2 + 2 SO2
ZnO + 2 HCl → ZnCl2 + H2O

What are ALL the possible mole ratios of the following equations – balance first then answer

2 H2O2 → 2 H2O + 1 O2
2 Na + 1 MgF2 → 2 NaF + 1 Mg
1 Cl2 + 2 KI → 2 KCl + 1 I2
2 Na + 2 HCl → 1 H2 + 2 NaCl
2 K + Cl2 → 2 KCl

the food using pesticides in the future will harm you by giving you diseases like cancer or something since they have things that we should not eat in it like chemicals or pesticides. that is why organic food is more expensive because they take the time to make it right and healthy for you to eat.

explanation:

as given the equation is

2al + 6 hcl > 2 alcl3 + 3 h2(g)

as per equation two moles of aluminum reacts with six moles of hcl to give two moles of alcl3 and three moles of hydrogen gas

given: three moles of al are present and 7 moles of hcl

for three moles of aluminum nine moles of hcl will be required

however as 7 moles of hcl are present so the limiting reagent is hcl

hcl is going to decide the number of moles of product formed

when six moles of hcl are present = 3 moles of h2 are formed

when one mole of hcl is present == 3/6 mole sof h2 will be formed

when 7 moles of hcl are present = 3 x 7/ 6 moles of h2 will be formed = 3.5 moles of h2