Type answer: of a chemical compound, More information on • CaI2 + Pb(NO3)2 = Ca(NO3)2 + PbI2 ↓ • 2 NH4I + Pb(NO3)2 = PbI2 ↓ + 2 NH4NO3 Then you would add enough more water to reach the 500 mL mark. Finding molar mass starts with units of grams per mole (g/mol). Sometimes you're given an unbalanced equation on the test when all the classroom examples used already-balanced equations. Potassium iodide can block absorption of radioactive iodine by the thyroid gland through flooding the thyroid with non-radioactive iodine and preventing intake of radioactive molecules, thereby protecting the thyroid from cancer causing radiation. A 0.500-L vinegar solution contains 25.2 g of acetic acid. Browse the list of We use the most common isotopes. Molar mass of KI is 166.00277 ± 0.00013 g/mol Compound name is potassium iodide Convert between KI weight and moles How many milliliters of 0.175 M Hg(NO3), is needed to completely precipitate 2.50 g KI? 49.8 grams of KI is dissolved in 1 L of solution have a molarity = 0.3M. Potassium Iodide is a metal halide composed of potassium and iodide with thyroid protecting and expectorant properties. What is the molality and mole fraction of solute KI (molar mass = 166.0 g/mole) in solute water (molar mass = 18.0 g/mole) that has a percent by mass KCl of 18.2%? The formula weight is simply the weight in atomic mass units of all the atoms in a given formula. Potassium iodide is a metal-halide salt featuring an ionic bond between the potassium cation (K +) and the iodide anion (I â). calculate mass of PbI 2 produced by reacting of 30.0 g KI with excess Pb(NO 3) 2. Multiply the relative atomic mass by the molar mass constant. Potassium iodide is a metal-halide salt featuring an ionic bond between the potassium cation (K +) and the iodide anion (I –). In chemistry, the formula weight is a quantity computed by multiplying the atomic weight (in atomic mass units) of each element in a chemical formula by the number of atoms of that element present in the formula, then adding all of these products together. 1) Molar mass of Pb(NO3)2 is 331.22 g/mol. So, you would place 12 g of #"KI"# in a 500 mL volumetric flask and add enough water to dissolve the solid. Molar mass calculator computes molar mass, molecular weight and elemental composition of any given compound. In other words, it is the mass of one mole of a particular substance. Note: The answer can have only two significant figures, because that is all you gave for the molarity of the #"KI"#. This is how to calculate molar mass (average molecular weight), which is based on isotropically weighted averages. This compound is also known as Potassium Iodide. 2) We are given 30.0 g of KI. 20% ( mass/mass ) aqueous KI solution means that Mass of KI = 20 g Mass of solution = 100 g Mass of solvent ( water ) = 100 - 20 = 80 g (1) Calculation of molality Molar mass of KI = 39 + 127 = 166 g mol⁻¹ nKI = 20 g/ 166 g mol⁻¹ = 0.120 In SI, the unit for molar mass is kg/mol. Calculations: Formula: KI Molar Mass: 166.003 g/mol 1g=6.02398751829786E-03 mol Percent composition (by mass): Element Count Atom Mass %(by mass) Use uppercase for the first character in the element and lowercase for the second character. Molar mass of KI, Potassium Iodide is 166.00277 g/mol. Mass percentage of the elements in the composition Atomic weight of Explanation: We need the molar mass of KI, we can find the molar mass with the atomic weight of potassium and iodo. 2KI (aq)+Pb (NO3)2 (aq)â¶PbI2 (s)+2KNO3 (aq) What mass of PbI2 (molar mass=416.0 g/mol) can be formed by adding 1.90 g ofKI to a solution of excess Pb (NO3)2? For bulk stoichiometric calculations, we are usually determining molar mass, which may also be called standard atomic weight or average atomic mass. This site explains how to find molar mass. Finding Molar Mass. Massa molar of KI Massa Molar, Peso Molecular e Calculadora da Composição Elementar Explanation of how to find the molar mass of KI: Potassium iodide. It is colourless to white, it appears as cubical crystals, or powder or white granules. To make 18.2%, 100 grams of total solution contains 18.2 g of KI 100 g - 18.2 g = 81.8 g water = 0.0818 kg; molar mass of KI: 165.97277 g. 0.05 mol × 165.97277 g / 1 mol = 8.2986385 g KI â
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