Molar Mass of Ammonium Dichromate ((NH4)2Cr2O7)
Molar Mass of Ammonium Dichromate is commonly used in ionic-equation practice and concentration calculations for salt solutions. Molar Mass of (NH₄)₂Cr₂O₇ is 252.06 g/mol, based on 4 element types, with O contributing the largest share.
For fast checks, use the calculate molar mass, verify element values in the periodic table with molar mass, or explore more molar mass calculations.
Molar Mass of Ammonium Dichromate is:
252.06 g/mol
Molar Mass of (NH₄)₂Cr₂O₇ equals 252.06 g/mol, so 252.06 grams is one mole.
Element Breakdown Table
| Element | Count | Atomic mass | Calculation | Contribution |
|---|---|---|---|---|
| Nitrogen (N) | 2 | 14.01 | 2 x 14.01 | 28.01 g/mol |
| Hydrogen (H) | 8 | 1.01 | 8 x 1.01 | 8.06 g/mol |
| Chromium (Cr) | 2 | 52.00 | 2 x 52.00 | 103.99 g/mol |
| Oxygen (O) | 7 | 16.00 | 7 x 16.00 | 111.99 g/mol |
Final molar mass 28.010 + 8.060 + 103.990 + 111.990 | 252.06 g/mol | |||
Computing Molar Mass of Ammonium Dichromate Step by Step
Molar Mass of Ammonium Dichromate: Step-by-Step Calculation
1. Identify Element Counts
Read (NH4)2Cr2O7 and list how many atoms of each element are present:
- 2 atoms of Nitrogen (N)
- 8 atoms of Hydrogen (H)
- 2 atoms of Chromium (Cr)
- 7 atoms of Oxygen (O)
2. Determine Atomic Masses
Look up each element mass from the periodic table:
- Nitrogen (N) ~= 14.007 g/mol
- Hydrogen (H) ~= 1.008 g/mol
- Chromium (Cr) ~= 51.996 g/mol
- Oxygen (O) ~= 15.999 g/mol
3. Multiply Atomic Mass by Quantity
Multiply atom count by atomic mass for each element:
- Nitrogen (N): 2 x 14.007 = 28.010 g/mol
- Hydrogen (H): 8 x 1.008 = 8.060 g/mol
- Chromium (Cr): 2 x 51.996 = 103.990 g/mol
- Oxygen (O): 7 x 15.999 = 111.990 g/mol
4. Sum Total Molar Mass
Add all contributions to get the final molar mass in g/mol.
Molar Mass = (2 x 14.007 + 8 x 1.008 + 2 x 51.996 + 7 x 15.999)
Molar Mass = 28.010 + 8.060 + 103.990 + 111.990
Molar Mass = 252.060 g/mol
Final rounded value shown on this page: 252.06 g/mol.
Visual Calculation Chart
| Element | Count | Mass | Count x mass | Contribution |
|---|---|---|---|---|
| Nitrogen (N) | 2 | 14.007 | 2 x 14.007 | = 28.010 |
| Hydrogen (H) | 8 | 1.008 | 8 x 1.008 | = 8.060 |
| Chromium (Cr) | 2 | 51.996 | 2 x 51.996 | = 103.990 |
| Oxygen (O) | 7 | 15.999 | 7 x 15.999 | = 111.990 |
Final molar mass 28.010 + 8.060 + 103.990 + 111.990 | = 252.060 | |||
Easy Way to Remember
Easy way to remember Molar Mass of Ammonium Dichromate
- Molar Mass of Ammonium Dichromate: count atoms, multiply masses, and add totals.
- Write each element in a table so you do not miss subscripts.
- Keep 2-3 decimals during steps, then round only at the end.
Sample Reactions
| Type | Reaction |
|---|---|
| Double displacement | AgNO₃ + NaCl → AgCl + NaNO₃ |
| Acid-salt reaction | Na₂CO₃ + ₂HCl → ₂NaCl + H₂O + CO₂ |
Do You Know?
– Ammonium Dichromate contains 4 element types: N, H, Cr, O.
– O contributes the largest share of this compound's total molar mass.
– In (NH₄)₂Cr₂O₇, H appears with the highest atom count.
– Its molar mass is 252.06 g/mol, which is used directly in gram-to-mole conversions.
– A common reaction for Ammonium Dichromate is double displacement (AgNO₃ + NaCl → AgCl + NaNO₃).
For more examples in the same format, browse the related formulas on molar mass page.
Why This Compound Matters
Ammonium Dichromate appears in ionic-reaction practice and precipitation examples in school chemistry.
Its molar mass helps students move quickly between grams, moles, and concentration problems.
Similar calculations can be compared with Ammonium Chromate ((NH4)2CrO4) and Ammonium Nitrate (NH4NO3).
Where This Is Used
- Competitive exams and school chemistry tests.
- Lab work when preparing measured solutions.
- Real-world manufacturing and quality checks.
Common Mistakes When Calculating This
- Skipping subscripts in (NH₄)₂Cr₂O₇ and miscounting atoms.
- Forgetting that parentheses in (NH₄)₂Cr₂O₇ multiply the entire grouped part.
- Mixing up O element contribution with total molar mass.
- Reporting a value without units; final answer should be in g/mol for Ammonium Dichromate.
Quick Revision
Formula: (NH4)2Cr2O7
Molar Mass: 252.06 g/mol
Key takeaway: count atoms accurately, multiply by atomic masses, and sum only at the end.
Formula Explanation
(NH4)2Cr2O7 contains Nitrogen (N) (2), Hydrogen (H) (8), Chromium (Cr) (2), Oxygen (O) (7). Add each element contribution to get total molar mass.
FAQ
Conclusion
Molar Mass of Ammonium Dichromate and Molar Mass of (NH₄)₂Cr₂O₇ are now easy to revise with this structured page. You can use this method in exams, lab reports, and daily chemistry practice.