Indicate the number of equivalents in each of the following:
4mol Mg2+
0.1mol H+
2mol Cl-
3mol Fe3+
0.7 mole of Mg2+
0.7 mole x 2 =1.4 Equivalent, then you should round to 1 Equivalent. So the answer is 1 Equivalent! Hope this helps
0.7 mole of Mg2+
Okay, let's break it down... or should I say, disassemble it? *wink*
1. 4 moles of Mg2+: Since Mg2+ carries a double charge, we multiply the number of moles by 2 to find the number of equivalents. So, 4 moles of Mg2+ is equal to 8 equivalents of Mg2+.
2. 0.1 moles of H+: Hydrogen ions, or H+, have only one charge. Therefore, 0.1 moles of H+ is equal to 0.1 equivalents of H+.
3. 2 moles of Cl-: Chloride ions, or Cl-, also carry a single charge. Therefore, 2 moles of Cl- is equal to 2 equivalents of Cl-.
4. 3 moles of Fe3+: Since Fe3+ carries a triple charge, we multiply the number of moles by 3 to find the number of equivalents. So, 3 moles of Fe3+ is equal to 9 equivalents of Fe3+.
Remember, when it comes to equivalents, it's all about the charges! *grin*
To determine the number of equivalents in a given amount of a substance, you need to consider the valence or charge of the ions involved. The valence or charge indicates how many electrons an ion has gained or lost. The value of the charge determines how many ions are needed to balance it, and each ion is considered one equivalent.
Let's calculate the number of equivalents for each of the given substances:
1. 4 mol Mg2+:
Since the charge of Mg2+ is 2+, it means that each Mg2+ ion has a valence of 2. Therefore, for every 1 mol of Mg2+, we have 2 equivalents. Thus, for 4 mol of Mg2+, we can calculate:
4 mol Mg2+ × 2 equivalents/mol = 8 equivalents of Mg2+.
2. 0.1 mol H+:
The charge of H+ is +1, and since the valence is 1, each H+ ion is equal to 1 equivalent. Therefore, for 0.1 mol of H+:
0.1 mol H+ × 1 equivalent/mol = 0.1 equivalent of H+.
3. 2 mol Cl-:
The charge of Cl- is -1, and since the valence is 1, each Cl- ion is equal to 1 equivalent. Therefore, for 2 mol of Cl-:
2 mol Cl- × 1 equivalent/mol = 2 equivalents of Cl-.
4. 3 mol Fe3+:
The charge of Fe3+ is 3+, so it means that each Fe3+ ion has a valence of 3. Therefore, for every 1 mol of Fe3+, we have 3 equivalents. So, for 3 mol of Fe3+:
3 mol Fe3+ × 3 equivalents/mol = 9 equivalents of Fe3+.
In summary:
- 4 mol Mg2+ is equal to 8 equivalents.
- 0.1 mol H+ is equal to 0.1 equivalent.
- 2 mol Cl- is equal to 2 equivalents.
- 3 mol Fe3+ is equal to 9 equivalents.
4 mol Mg^2+ = 8 equivalents
0.1 mol H+ = 0.1 equivalent
2 mol Cl^- = 2 equivalents
3 mol Fe^3+ = 9 equivalents.
How does this work?
1 mol Mg = 24.3; 4 mols = 97.2 g
1 eq Mg = 24.3/2 = 12.15g. 97.2/12.15 = 8 equivalents. (2 is the valence but this isn't always the equivalent weight of Mg. It depends upon the reaction.)
1 equivalent Fe = 55.85/3 = ?
1 equivalent H = 1/1 = ?