Molar Mass of Lead(II) Dichromate (PbCr2O7)
Molar Mass of Lead(II) Dichromate is commonly used in ionic-equation practice and concentration calculations for salt solutions. Molar Mass of PbCr₂O₇ is 423.19 g/mol, based on 3 element types, with Pb 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 page.
Molar Mass of Lead(II) Dichromate is:
423.19 g/mol
Molar Mass of PbCr₂O₇ equals 423.19 g/mol, so 423.19 grams is one mole.
Element Breakdown Table
| Element | Count | Atomic mass | Calculation | Contribution |
|---|---|---|---|---|
| Lead (Pb) | 1 | 207.20 | 1 x 207.20 | 207.20 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 207.200 + 103.990 + 111.990 | 423.19 g/mol | |||
Computing Molar Mass of Lead(II) Dichromate Step by Step
Molar Mass of Lead(II) Dichromate: Step-by-Step Calculation
1. Identify Element Counts
Read PbCr2O7 and list how many atoms of each element are present:
- 1 atom of Lead (Pb)
- 2 atoms of Chromium (Cr)
- 7 atoms of Oxygen (O)
2. Determine Atomic Masses
Look up each element mass from the periodic table:
- Lead (Pb) ~= 207.200 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:
- Lead (Pb): 1 x 207.200 = 207.200 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 = (1 x 207.200 + 2 x 51.996 + 7 x 15.999)
Molar Mass = 207.200 + 103.990 + 111.990
Molar Mass = 423.190 g/mol
Final rounded value shown on this page: 423.19 g/mol.
Visual Calculation Chart
| Element | Count | Mass | Count x mass | Contribution |
|---|---|---|---|---|
| Lead (Pb) | 1 | 207.200 | 1 x 207.200 | = 207.200 |
| 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 207.200 + 103.990 + 111.990 | = 423.190 | |||
Easy Way to Remember
Easy way to remember Molar Mass of Lead(II) Dichromate
- Molar Mass of Lead(II) 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?
– Lead(II) Dichromate contains 3 element types: Pb, Cr, O.
– Pb contributes the largest share of this compound's total molar mass.
– In PbCr₂O₇, O appears with the highest atom count.
– Its molar mass is 423.19 g/mol, which is used directly in gram-to-mole conversions.
– A common reaction for Lead(II) Dichromate is double displacement (AgNO₃ + NaCl → AgCl + NaNO₃).
Why This Compound Matters
Lead(II) 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 Lead(II) Chromate (PbCrO4) and Sodium Chromate (Na2CrO4).
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 PbCr₂O₇ and miscounting atoms.
- Rounding atomic masses too early before finishing all multiplication steps.
- Mixing up Pb element contribution with total molar mass.
- Reporting a value without units; final answer should be in g/mol for Lead(II) Dichromate.
Quick Revision
Formula: PbCr2O7
Molar Mass: 423.19 g/mol
Key takeaway: count atoms accurately, multiply by atomic masses, and sum only at the end.
Formula Explanation
PbCr2O7 contains Lead (Pb) (1), Chromium (Cr) (2), Oxygen (O) (7). Add each element contribution to get total molar mass.
FAQ
Conclusion
Molar Mass of Lead(II) Dichromate and Molar Mass of PbCr₂O₇ are now easy to revise with this structured page. You can use this method in exams, lab reports, and daily chemistry practice.
Whenever you want to branch out, return through molar mass guide for the full molar mass toolkit.