Activity In the activity, you will balance two equations at each level: easy, medium, and hard. The equations to balance are listed below. Solve these equations and write their answers in the space provided. Easy 1. K + Br2 - KBr 2. Sb + O2 - Sb406 Medium 1. Na + H2O NaOH + H2 2. KNO3 KNO2 + O2 Hard 1. NH3 + O2 - NO + H2O 2. GHOH + O2 – CO2 + H2O

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

metric time was an attempt to create a standard unit of time based off of 10, but it never took off an is not included in the metric system (si)