Answer:
D) a salt bridge
Explanation:
A salt bridge completes an electrochemical cell. A salt bridge maintains charge balance in the two half cells. If the salt bridge is not present, the anode compartment becomes positively charged while the cathode compartment becomes negatively charged hence the reaction reaches equilibrium and comes to a halt quickly.
Answer:
1.17 mol
Explanation:
Step 1: Write the balanced equation
2 Al + 6 HCl → 2 AlCl₃ + 3 H₂
Step 2: Calculate the moles corresponding to 85.0 g of HCl
The molar mass of HCl is 36.46 g/mol.
85.0 g × 1 mol/36.46 g = 2.33 mol
Step 3: Calculate the number of moles of H₂ produced from 2.33 moles of HCl
The molar ratio of HCl to H₂ is 6:3.
2.33 mol HCl × 3 mol H₂/6 mol H₂ = 1.17 mol H₂
7,000 is 100 times larger than 70
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Because it can be balanced in an infinite number of ways so it would need to be rewritten in a simpler form.
2C2H2 + 5O2 ---> 4CO2 + 2H2O
<span>mole ratio of O2:C2H2 is 2.5:1 </span>
<span>for 37 mol C2H2 you need 2.5 x 37 mol = 92.5 moles O2. </span>
<span>Thus, O2 is limiting.</span>
