2006-11-13 12:00:12 · 6 answers · asked by frickenawesomekoreanandyouknowit 2 in Science & Mathematics ➔ Chemistry
The number after an element is the number of atoms of that element.
Start with NH4
NH4 has:
1 nitrogen
4 hydrogen
-----
Total of 5
Because it is in parentheses, that means there are multiple molecules of NH4... specifically 2 of them.
Thus (NH4)2 has 10 atoms (5 x 2).
Then you have:
Cr2 --> 2 atoms of cromium
O7 --> 7 atoms of oxygen
Altogether you have 10 + 2 + 7 = 19 atoms in a molecule of (NH4)2Cr2O7
2006-11-13 12:02:21 · answer #1 · answered by Puzzling 7 · 0⤊ 0⤋
19
2006-11-13 12:02:36 · answer #2 · answered by Sara 2 · 0⤊ 0⤋
19
2006-11-13 12:02:03 · answer #3 · answered by Anonymous · 0⤊ 0⤋
19 atoms in total
2N
8H
2Cr
7O
2006-11-13 12:02:35 · answer #4 · answered by Silas 2 · 0⤊ 0⤋
7 TRILLION, 392 BILLION, 371MILLION, 872 THOUSAND, 402
IT TOOK ME 26 DAYS TO FIGURE THIS OUT. THANK FOR THE 10.
2006-11-13 12:04:46 · answer #5 · answered by Anonymous · 0⤊ 0⤋
19
2-N
8-H
2-Cr
7-O
2006-11-13 12:02:41 · answer #6 · answered by Anonymous · 0⤊ 0⤋