Answer:
balanced in ACID not BASE
Cr2O7^2-(aq) +3Hg(l) +14 H^1+ ----> 3Hg^2+ + 2Cr^3+(aq) + 7H2O
Answer
Cr2O7^2-(aq) +3Hg(l) +14 H^1+ ----> 3Hg^2+ + 2Cr^3+(aq) + 7H2O
Explanation:
Cr2O7^2-(aq) + Hg(l) ----> Hg^2+(aqH) + Cr^3+(aq)
add H^1+ (acid) to capture the O and make 7 water molecules
Cr2O7^2-(aq) + Hg(l) + H^1+ ----> Hg^2+(aqH) + Cr^3+(aq) + 7H2O
Cr goes from +6 to +3 by gaining 3 e
Hg goes from 0 to +2 by losing 2 e
we need 3 Hg for every 2 Cr
so
Cr2O7^2-(aq) +3Hg(l) +14 H^1+ ----> 3Hg^2+ + 2Cr^3+(aq) + 7H2O
2 Cr on the right and left
Net 12 positive charges on the right and the left
3 Hg on the right and left
14 H on the right and left
the equation is balanced
we cannot balance the equation in a basic solution with OH^1-
we have plenty of O in the dichromate ion. we need to convert it to water which take free H^1+ from the acid
it is either "aweak acid or a lousy (or very weak) acid"
The answer is either D or B. hope this helps.
Answer:
6. a. 5.53 (m/m) %; b. 0.7490M
7. 0.156M
Explanation:
6. In the solution of KCl, there are 1.396g of KCl in 25.225g of solution. As mass/mass percent is:
Mass solute / Mass solution * 100
The mass/mass percent of KCl is:
a. 1.396g KCl / 25.225g solution * 100
5.53 (m/m) %
b. Molarity is moles of solute per liters of solution:
<em>Moles KCl -Molar mass: 74.55g/mol-:</em>
1.396g KCl * (1mol / 74.55g) = 0.018726 moles KCl
<em>Volume in liters: 25mL = 0.025L</em>
Molarity:
0.018726 moles KCl / 0.025L = 0.7490M
7. 0.90% means 0.90g of NaCl in 100g of solution:
<em>Moles NaCl -Molar mass: 58.44g/mol-:</em>
0.90g NaCl * (1mol / 58.44g) = 0.0154 moles NaCl
<em>Volume in Liters:</em>
100g * (1mL / 1.01g) = 99mL = 0.099L
Molarity:
0.0154 moles NaCl / 0.099L =
0.156M
Answer:
Mechanical Energy = A
Gravitational Energy = C
Nuclear Energy = B
Thermal Energy = D
Explanation:
Hope this helps you :) If any are wrong, I'm very sorry.
