Molar Mass of (NH4)2Cr2O7 (Ammonium Dichromate)
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What is the molar mass of (NH4)2Cr2O7?
Answer
M((NH4)2Cr2O7) =
252.063 g/mol
Atomic weights: IUPAC standard values (CIAAW, 2024).
(NH4)2Cr2O7 = 2 × (N + 4 H) + 2 Cr + 7 O → N 2, H 8, Cr 2, O 7
| Element | Atoms, n | Atomic weight, A | n × A, g/mol Mass fraction, w | |
|---|---|---|---|---|
| Nnitrogen | 2 | 14.007 | 28.014 w ≈ 11.11% | ≈ 11.11% |
| Hhydrogen | 8 | 1.0080 | 8.0640 w ≈ 3.20% | ≈ 3.20% |
| Crchromium | 2 | 51.996 | 103.992 w ≈ 41.26% | ≈ 41.26% |
| Ooxygen | 7 | 15.999 | 111.993 w ≈ 44.43% | ≈ 44.43% |
| Σ = 252.063 g/mol w = 100% | 100% | |||
Atomic weights: CIAAW, Abridged Standard Atomic Weights (2024)
O 44.43%Cr 41.26%
N 11.11%H 3.20%
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Molar masses of substances nearby
| Formula | M, g/mol |
|---|---|
| MgSO₄·7H₂O (magnesium sulfate heptahydrate) | 246.47 |
| Ag₂S (silver sulfide) | 247.80 |
| CuSO₄·5H₂O (copper(II) sulfate pentahydrate) | 249.68 |
| (NH₄)₂Cr₂O₇ (ammonium dichromate) | 252.063 |
| BaCrO₄ (barium chromate) | 253.32 |
| I₂ (iodine) | 253.80 |
| S₈ (octasulfur) | 256.48 |