In the lab you measure 0.65 g of aluminum foil and place it in a beaker under the hood. Very carefully you measure 2.0 mL of Br2 ( 2 needs to be subscript) (density 2.928 g/mL), aslo under the hood, and pour it into the beaker with the aluminum foil. A really cool reaction occurs. What is the limiting reagent? Show ALL necessary calculations.© BrainMass Inc. brainmass.com October 24, 2018, 5:59 pm ad1c9bdddf
The first step in solving this type of questions is writing a balanced chemical reaction. So
2Al + 3Br2 --> 2AlBr3
The second step is converting the given amount of the ...
Solution includes the following steps: (1) write the balanced equation, (2) convert the given amount of the reactants into molar amount and (3) use the balanced equation to calculate how many mole of Br2 should be needed to react with 0.024 mol of Al.
Limiting Reactant and Excess Reactant (Reagent)
1. What is the balanced chemical equation of CuSO₄and NaS?
2. Which of the following contains an excess of CuSO₄, or NaS, or neither? (excluding Test tubes 1 and 7)
Test tube 1: 6 mL CuSO₄ and 0 mL NaS
Test tube 2: 5 mL CuSO₄ and 1 mL NaS
Test tube 3: 4 mL CuSO₄ and 2 mL NaS
Test tube 4: 3 mL CuSO₄ and 3 mL NaS
Test tube 5: 2 mL CuSO₄ and 4 mL NaS
Test tube 6: 1 mL CuSO₄ and 5 mL NaS
Test tube 7: 0 mL CuSO₄ and 6 mL NaS
test solutions used: 6M NH3(20mL) and 0.4 ZnSO4
3. Which has the largest amount of precipitate?
a) What was the ratio of CuSO₄and NaS used?
4. What is chemical formula for copper (II) sulfide?
5. Explain how excess reagents and the amount of precipitate is formed?View Full Posting Details