Question

Show all working clearly, give all details where necessary and provide complete sentences for fullmarks 1. What is meant by the term o metry? 2. Why is the relative number of moles of reactants and products the most important information that a balanced chemical equation provides? points) 3. Define the term moler mais 4. The coeficients from a balanced chemical equation are used to write conversion factors called 5. How many molecules are there in: 2.00 moles of ammonia? How many more then 3.612x3 molecules of ghosene? 0.50 moleschlorine 101 x 10 molecules offreon 0.250 moles oxygen? points) 6. Calculate how many grams of each chemicals in each of the following a. 5.00 males of lead 2.00 moles of sodium Hydroxide € 2.50 moles of possible. 7. Calculate the following How many moles of phosphoric acid are there in of phosphoric acid H.PO, b. How many molesoftin fluoride are there in 90 gr a de c. How many moles of hydrogen perode HD are there in 1000 hydrogen peroxide .? points The equation for the formation of potassium chloride is given by the equation 2 . write the si possible meleration for this equation points Sodium chloride, NaCl, forms by this reaction between sodium and chlorine 2NC +2 N shut there How many moles of Naresh from the complete reaction of 1 mol is enough Na to react completely with a points) 30. Potassium chlorate decomposes to form potassium chloride and one pas a Write a balanced equation showing this chemical change b. Determine the amount of oxygen produced when 0.549 of decomposes. The molar mass of O, is 120 g/mol and the molar mass of D is 1226 mol (13 points the o ther 11. How much energy is produced from the combustion of mass of methane is 26.042 g/mol points! Total 40 points

Answer 1

1.Stoichiometry

Stoichiometry can be defined by

1) a) the affinity between the constituents of a chemical substance in a quantitive manner.

b) Measure the quantity of Substances which involved in physical or chemical switch experiments,

2) Accords with the mass and energy conservation to chemical activity and applying the laws of definite proportions.

2. Relative number of moles

Relative number of moles of reactants and products in the balanced equation is to provide the convenience for balancing the equation. To know about the nature of the reaction.

3.Molar Mass

Molar Mass is calculated by dividing mass of the given chemical element(g) and the amount of Substance(mol)

molar mass = mass(g) / moles

4. The coeeficents in the balance equation used to write the conversion factors are Mole ratios

5. How many molecules are there in

a)2.00 moles of ammonia

ans) 1.2044 * 10²⁴

b)0.50 moles of chlorine

ans) 3.0115 * 10²³

c)0.25 moles of oxygen

ans) 1.5057 * 10²³

^{How many moles are there in}

The power values are blurred and cannot be viewed for solving

6. a)1036g of lead

b) 79.9g of Sodium hydroxide

c) 212.7g of Potassium nitrate

7. a) 6.715 mol of phosphoric acid.

b) 5.79 mol of tin (II) fluoride

c) 29.39 mol of Hydrogen peroxide

8. K:Cl2, K:KCl, Cl2:K, KCl:K,KCl:Cl2, Cl2:KCl