Molar Mass of K₂Cr₂O₇
Potassium dichromate. An orange oxidising agent with chromium in the +6 state.
Molar mass of K2Cr2O7
294.181 g/mol
2 × 39.098 + 2 × 51.996 + 7 × 15.999 = 294.181
Calculation, element by element
| Element | Atoms | Atomic mass (g/mol) | Subtotal | Mass % |
|---|---|---|---|---|
| Potassium (K) | 2 | 39.098 | 78.196 | 26.58% |
| Chromium (Cr) | 2 | 51.996 | 103.992 | 35.35% |
| Oxygen (O) | 7 | 15.999 | 111.993 | 38.07% |
| Total | 294.181 | 100% |
= 0.033993 mol = 2.0471 × 1022 formula units
K₂Cr₂O₇ molar mass FAQ
What is the molar mass of potassium dichromate (K₂Cr₂O₇)?
294.181 g/mol. It is the sum of the atomic masses of every atom in the formula: 2 × 39.098 + 2 × 51.996 + 7 × 15.999 = 294.181 g/mol.
How many grams are in one mole of K₂Cr₂O₇?
294.181 g. Molar mass is the mass of one mole (6.022 × 10²³ formula units), so 1 mol of K₂Cr₂O₇ weighs 294.181 g and 0.5 mol weighs 147.090 g.
How many moles are in 10 g of K₂Cr₂O₇?
10 g ÷ 294.181 g/mol = 0.03399 mol.
What is the percent composition of K₂Cr₂O₇?
Potassium 26.58%, Chromium 35.35%, Oxygen 38.07%.
Is molecular weight the same as molar mass for K₂Cr₂O₇?
Numerically yes: the molecular (or formula) weight is 294.181 u per formula unit, and the molar mass is 294.181 g/mol.
Molar masses of other common compounds
H2O WaterNaCl Sodium chlorideNaOH Sodium hydroxideC6H12O6 GlucoseCO2 Carbon dioxideHCl Hydrochloric acidH2SO4 Sulfuric acidO2 Oxygen gasCaCO3 Calcium carbonateC2H5OH EthanolNH3 AmmoniaN2 Nitrogen gasCH4 MethaneCuSO4 Copper(II) sulfateKMnO4 Potassium permanganateMgCl2 Magnesium chlorideCuSO4·5H2O Copper(II) sulfate pentahydrateNaHCO3 Sodium bicarbonateNa2CO3 Sodium carbonateKCl Potassium chlorideHNO3 Nitric acidH3PO4 Phosphoric acidCH3COOH Acetic acidC12H22O11 SucroseH2O2 Hydrogen peroxideCa(OH)2 Calcium hydroxideFe2O3 Iron(III) oxideAl2O3 Aluminium oxideAgNO3 Silver nitrateNH4NO3 Ammonium nitrateC8H10N4O2 CaffeineC9H8O4 AspirinC3H8 PropaneC8H18 OctaneH2 Hydrogen gasCl2 Chlorine gasO3 OzoneCO Carbon monoxideSO2 Sulfur dioxideKOH Potassium hydroxideMgO Magnesium oxideCaCl2 Calcium chlorideNaNO3 Sodium nitrateBaSO4 Barium sulfate