Question

1. What is meant by the term "limiting reactant"? 2. If some magnesium f some magnesium metal and some sulfurie neid solution were reacted, explain how what you see tells you which is the limiting reactant. 3. Look up the melting point of zinc chloride: Typically, lab burners have a flame temperature of about 600°C, why must the burner be removed as soon as the water evaporates? 4. Write the balanced chemical equation (including state descriptors) for the reaction between zinc and hydrochloric acid. 5. If 6.79 g of aluminum were reacted with excess sulfuric acid to produce 37.86 g of aluminum sulfate, what is the percent yield? (Hint, find the theoretical yield first.) (theoretical: 43.1 g; 87.9%) 2Al(s)+3H,SO. (aq) → A1, (80.), (aq) + 3H2 (8)

Answer 1

1. Limiting reactants are the reactant which is present in less amount than it needed stoichiometrically. Means the reactant which is present in less amount than actually needed to complete tge reaction.

2. We will calculate the moles of Magnessium and Sulphuric acid after calculating the moles we can determine which is limiting reactant after comaring the stoichiometry.

3. Melting point = 170 degree C

Now after removing of water we have to remove the burner because if the burner will placed continuously it will melt Zinc chloride after few seconds and may spill it out.

4.

4. Reaction between zinc and Hydrochloric Acid. zn (A) + 2Hce (as) - Zulla cap + H₂ (g) (zinc chlosa) (zind Hydrochoricaria) hydrogen) gay