Based on information from the periodic table, which of the following is the molecular formula of a substance that has this molar mass? Potassium Permanganate KMnO4 Molar Mass, Molecular Weight. The molar mass of Fe(NH 4) 2 (SO 4) 2. and this explanation is making this assumption. The number of moles of anything is calculated from the mass of sample and the molar mass. Formula: KMnO4. Molar Mass: 158.0339. Home » Chemistry » Potassium Permanganate. ... Potassium permanganate, KMnO4, is an ionic compound between a potassium ion, K+, and the polyatomic ion permanganate. The molar mass of potassium permanganate is 158 g/mol. Now, I think that you're supposed to assume that adding that much potassium permanganate to 30.0 mL of water will not change the volume of the solution. 6H 2 O is 392.2 g. Potassium permanganate, or KMnO4, has a molar mass of 158g/mol. Then, moles is converted to grams. That would be five. The molar mass of a potassium permanganate is 158.04 grams per mole.This is to say that the mass of one mole of potassium permanganate is 158.04 grams or that 6.02 x 10 to the 23rd power ions of potassium permanganate have a mass of 158.04 grams. KMnO4 is a dark purple crystal at room temperature. If using 400 mg tablets, add one to each 4 L of water. A compound has a molar mass of 123.22 g/mol. Potassium Permanganate (KMnO 4) is an inorganic chemical compound. The coordination geometries around the chromium atoms are tetrahedral. Its melting point is 240 ̊C (464 ̊F), density 2.7 g/cm3. Name: Potassium Permanganate. Step 3: Think about your result. We calculate the molar mass of Potassium permanganate (KMnO4) by adding the atomic masses of K, Mn and O (Note: there are 4 atoms of O) The atomic masses are as follows K = 39 Mn = 55 O = 16 The molar mass of KMnO4 = 39 + 55 + 16x4 = 158 g/mol A potassium permanganate solution is made by dissolving crystals or powder in water aiming for a 1-in-10,000 solution. Step 2: Solve. Let's assume that this is the case. (39+55+16x4). % composition of K: 39/158=0.247=24.7%. When 119 g of potassium permanganate is dissolved into water to make 3.00 L of solution, the molarity is 0.250 M. KMnO4 is a strong oxidizing agent. mass KMnO 4 = ? molar mass KMnO 4 = 158.04 g/mol; Unknown . Formula and structure: The chemical formula of potassium permanganate is KMnO 4 and its molar mass is 158.034 g/mol. and when we have the molar mass of the KMnO4 = 158/mol we can get the number of moles of KMnO4 = mass of KMnO4 / molar mass of KMnO4 no.of moles of KMnO4 = 32.45 / 158 = 0.2 mol when the no.of moles is less than 0.35 ∴KMnO4 will not dissolve because the number of moles is less than 0.35 mol that given in the question. One mole of KMnO4 in a liter of water is 158.75 gms and is a one molar solution. Potassium dichromate is an ionic compound consisting of two potassium cations and one dichromate anion. Molar mass To find the equivalent mass, divide that molar mass by the mols of electrons taken in its half reaction. First I’m assuming that the no actually means ml. It is soluble in water. % composition of Mn: 55/158=0.348=34.8%. Use potassium permanganate's molar mass to find the number of moles you have Potassium permanganate tablets can also be used. 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