Show all caculations 1. Balance the following equations c. FeCl3 MgO >Fe203 MgCl
ID: 1029559 • Letter: S
Question
Show all caculations
1. Balance the following equations c. FeCl3 MgO >Fe203 MgCl2 d. ZnS + O2--> ZnO + SO2 2.a. What is the mass of 5.0 moles of helium? b. What is the mass of 0.2 mole of phosphorus? c. What is the molar mass of potassium chloride (KCI)? d. What is the molar mass of magnesium chloride? 3. If a sample of KCl contains 5.0 moles of KCl, how many KCl molecules does the sample contain? 4. Is the following reaction endothermic or exothermic? How do you know? Reaction Coordrat 5. This is the balanced reactrion for the formation of ammonia Use this equation to demonstrate how the total masses on each side of the equation follow the law of conservation of mass. See figure 7.13 in your book for an example.Explanation / Answer
1. a. H2SO4 + 2NaOH---------> Na2So4 + 2H2O
b. 2H2 + O2 ---------> 2H2O
c. 2FeCl3 + 3MgO --------> Fe2O3 + 3MgCl2
d. 2ZnS + 3O2 ------> 2ZnO + 2SO2
2. a.
mass of He = no of moles * gram atomic mass
= 5*4 = 20g
b. mass of P = no of moles * gram matomic mass
= 0.2*31 = 6.2g
c. molar mass of KCl = 39+35.5 = 74.5g/mole
d. molar mass of MgCl2 = 24+35.5*2 = 95g/mole
3.no of molecules = no of moles * 6.023*10^23
= 5*6.023*10^23
= 3.0115*10^24 molecules
4. DH = Hp-HR
in this diagram HR> HP
So it is exothermic reaction