Calculating Molar Concentrations from the Mass of Solute Distilled white vinegar ( [link] ) is a solution of acetic acid, CH 3 CO 2 H, in water. The formula weight is simply the weight in atomic mass units of all the atoms in a given formula. Calculations: Formula: Ki/I2 Molar Mass: 41.098 g/mol 1g=.02433208428634 mol Percent composition (by mass): Element Count Atom Mass %(by mass) To complete this calculation, you have to know what substance you are trying to convert. 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. Moles in 56.3g = 56.3/331.22 = 0.170 mol . Finding Molar Mass. 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. Atomic weight of What is the mass of potassium iodide (molar mass = 166.0 g/mol) in 50.0 mL of 5.75 x 10–2 M KI (aq)?, a. A 0.500-L vinegar solution contains 25.2 g of acetic acid. This site explains how to find molar mass. Calculating Molar Concentrations from the Mass of Solute Distilled white vinegar (Figure 2) is a solution of acetic acid, CH 3 CO 2 H, in water. Using the chemical formula of the compound and the periodic table of elements, we can add up the atomic weights and calculate molecular weight of the substance. Do a quick conversion: 1 grams KI = 0.0060239958646473 mole using the molecular weight calculator and the molar mass of KI. The average atomic mass (sometimes called atomic weight) of an element is the weighted average mass of the atoms in a naturally occurring sample of the element. Formula weights are especially useful in determining the relative weights of reagents and products in a chemical reaction. Lead(II) Iodide PbI2 Molar Mass, Molecular Weight. From the equation: This will react with 0.170*2 = 0.340 mol KI 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 reason is that the molar mass of the substance affects the conversion. Then you would add enough more water to reach the 500 mL mark. Do a quick conversion: 1 grams KI = 0.0060239958646473 mole using the molecular weight calculator and the molar mass of KI. ThyroShield is currently not in production. Calculate the molecular weight Potassium iodide is an inorganic chemical compound which is denoted by the chemical formula KI. It is soluble in water. Molar mass of KI = 166.00277 g/mol. The percentage by weight of any atom or group of atoms in a compound can be computed by dividing the total weight of the atom (or group of atoms) in the formula by the formula weight and multiplying by 100. Convert grams KI to moles or moles KI to grams. Multiply the relative atomic mass by the molar mass constant. However chemists almost always express molar masses in g/mol … For normal samples from earth with typical isotope composition, the atomic weight can be approximated by the standard atomic weight or the conventional atomic weight. In the developing world it is also used to treat skin sporotrichosis and phycomycosis. Note: The answer can have only two significant figures, because that is all you gave for the molarity of the #"KI"#. Finding molar mass starts with units of grams per mole (g/mol). Solution: 1) The equation is balanced. If you need more precision, you will have to recalculate. The Swedish manufacturing facility for Thyrosafe, a half-strength potassium iodide tablet fo… Mercury(II) Iodide HgI2 Molar Mass, Molecular Weight. Use uppercase for the first character in the element and lowercase for the second character. Potassium iodide is a chemical compound, medication, and dietary supplement. Examples: Fe, Au, Co, Br, C, O, N, F. You can use parenthesis or brackets []. Solution for 6. • CaI2 + Pb(NO3)2 = Ca(NO3)2 + PbI2 ↓ • 2 NH4I + Pb(NO3)2 = PbI2 ↓ + 2 NH4NO3 This is not the same as molecular mass, which is the mass of a single molecule of well-defined isotopes. What is Potassium Iodide (KI)? These relative weights computed from the chemical equation are sometimes called equation weights. Potassium iodide is a metal-halide salt featuring an ionic bond between the potassium cation (K +) and the iodide anion (I –). ) in formulas for adduct molecules, such as water of hydration. Massa molar of KI Massa Molar, Peso Molecular e Calculadora da Composição Elementar Atomic weight of . ›› KI molecular weight. Counting the number of atoms of each element in the compound. Calculations: Formula: KI Molar Mass: 166.003 g/mol 1g=6.02398751829786E-03 mol Percent composition (by mass): Element Count Atom Mass %(by mass) Determine the molar mass of {eq}\displaystyle KI {/eq} by adding up the molar masses of the constituent elements. Potassium iodide is an inorganic chemical compound which is denoted by the chemical formula KI. Finding the molar mass by means of calculating the sum of the atomic weight of the atoms, which form the compound multiplied by the their numbers. Calculating Molar Concentrations from the Mass of Solute Distilled white vinegar is a solution of acetic acid, CH 3 CO 2 H, in water.A 0.500-L vinegar solution contains 25.2 g of acetic acid. Note: The answer can have only two significant figures, because that is all you gave for the molarity of the #"KI"#. (Molar mass of KI = 166.0 g/mol) %3D Hg (NO3)2 (aq) + 2 KI (aq) 2 KNO3 (aq) + Hgl2 (s) Finding Molar Mass. 2KI (aq)+Pb (NO3)2 (aq)⟶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? When calculating molecular weight of a chemical compound, it tells us how many grams are in one mole of that substance. Calculations: Formula: Ki/I2 Molar Mass: 41.098 g/mol 1g=.02433208428634 mol Percent composition (by mass): Element Count Atom Mass %(by mass) common chemical compounds. 1) Molar mass of Pb(NO3)2 is 331.22 g/mol. Then you would add enough more water to reach the 500 mL mark. Average masses are generally expressed in unified atomic mass units (u), where 1 u is equal to exactly one-twelfth the mass of a … 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%? Convert grams KI to moles  or  moles KI to grams, Molecular weight calculation: Potassium Iodide is a metal halide composed of potassium and iodide with thyroid protecting and expectorant properties. So, you would place 12 g of #"KI"# in a 500 mL volumetric flask and add enough water to dissolve the solid. Molar mass of KI is 166.00277 ± 0.00013 g/mol Compound name is potassium iodide Convert between KI weight and moles Molar mass calculator computes molar mass, molecular weight and elemental composition of any given compound. Massa molar of KI Massa Molar, Peso Molecular e Calculadora da Composição Elementar Potassium iodide is a metal-halide salt featuring an ionic bond between the potassium cation (K +) and the iodide anion (I –). 39.0983+126.90447. The two masses have the same numerical value, but the units are different: The molecular mass is the mass of 1 molecule while the molar mass is the mass of 6.022 × 10 23 molecules. Calculations: Formula: KI Molar Mass: 166.003 g/mol 1g=6.02398751829786E-03 mol Percent composition (by mass): Element Count Atom Mass %(by mass) Definitions of molecular mass, molecular weight, molar mass and molar weight. If you need more precision, you will have to recalculate. Question 6 Status: Not yet answered Points possible: 1.00 Consider the balanced equation of KI (molar mass=166.0 g/mol) reacting with Pb(NO3)2 to form a precipitate. The molar mass of atoms of an element is given by the relative atomic mass of the element multiplied by the molar mass constant, M u ≈ 1.000 000 × 10 −3 kg/mol = 1.000000 g/mol. Sometimes you're given an unbalanced equation on the test when all the classroom examples used already-balanced equations. So, you would place 12 g of #"KI"# in a 500 mL volumetric flask and add enough water to dissolve the solid. In other words, it is the mass of one mole of a particular substance. > Type answer: Make sure you do these problems with a balanced chemical equation. • CaI2 + Hg(NO3)2 = HgI2 + Ca(NO3)2 Molar mass of KI, Potassium Iodide is 166.00277 g/mol. What is Potassium Iodide (KI)? 288 g, b. Molecular mass (molecular weight) is the mass of one molecule of a substance and is expressed in the unified atomic mass units (u). It will calculate the total mass along with the elemental composition and mass of each element in the compound. It will calculate the total mass along with the elemental composition and mass of each element in the compound. 0.191 g, c. 0.00288 g, d. 0.477 g, e. 191 g 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 Three companies (Anbex, Inc., Fleming Co, and Recipharmof Sweden) have met the strict FDA requirements for manufacturing and testing of KI, and they offer products (IOSAT, ThyroShield, and ThyroSafe, respectively) which are available for purchase. This compound is also known as Potassium Iodide. In SI, the unit for molar mass is kg/mol. Examples: Fe, Au, Co, Br, C, O, N, F. You can use parenthesis or brackets []. Explanation: We need the molar mass of KI, we can find the molar mass with the atomic weight of potassium and iodo. (Molar mass of KI = 166.0 g/mol) → 2 KNO3(aq) + Hgl2(s)… A 0.500-L vinegar solution contains 25.2 g of acetic acid. of a chemical compound, More information on Molar mass calculator computes molar mass, molecular weight and elemental composition of any given compound. We can find this information using the periodic table of the elements. calculate mass of PbI 2 produced by reacting of 30.0 g KI with excess Pb(NO 3) 2. Finding the atomic masses of elements in the periodic table. 2 KI (aq) + Pb(NO3)2 (aq) Pbl (s) +2 KNO3(aq) What mass of Pbl, (molar mass=416.0 g/mol) can be formed by adding 8.22 g of KI to a solution of excess Pb(NO3)2 ? 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; 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; It is colourless to white, it appears as cubical crystals, or powder or white granules. 39.0983 + 126.90447. For bulk stoichiometric calculations, we are usually determining molar mass, which may also be called standard atomic weight or average atomic mass. Example 3. molar mass of KI: 165.97277 g. 0.05 mol × 165.97277 g / 1 mol = 8.2986385 g KI ≅ 8.30 g KI. 49.8 grams of KI is dissolved in 1 L of solution have a molarity = 0.3M. Use uppercase for the first character in the element and lowercase for the second character. Determine the molar mass of {eq}\displaystyle KI {/eq} by adding up the molar masses of the constituent elements. If the formula used in calculating molar mass is the molecular formula, the formula weight computed is the molecular weight. How many milliliters of 0.175 M Hg(NO3), is needed to completely precipitate 2.50 g KI? Explanation of how to find the molar mass of KI: Potassium iodide. This converts atomic units to grams per mole, making the molar mass of hydrogen 1.007 grams per mole, of carbon 12.0107 grams per mole, of oxygen 15.9994 grams per mole, and of chlorine 35.453 grams per mole. molar mass and molecular weight. Browse the list of As a medication it is used to treat hyperthyroidism, in radiation emergencies, and to protect the thyroid gland when certain types of radiopharmaceuticals are used. We use the most common isotopes. Molecular weight calculation: 39.0983 + 126.90447 ›› Percent composition by element molar mass of KI: 165.97277 g. 0.05 mol × 165.97277 g / 1 mol = 8.2986385 g KI ≅ 8.30 g KI. Molar Mass: 166.0028 KI is a white crystal at room temperature. The molar mass is a physical property, which is defined as the mass of a substance divided by its amount of substance in moles. In 2012, Fleming Co. sold all its product rights and manufacturing facility to other companies and no longer exists. Mass percentage of the elements in the composition This compound is also known as Potassium Iodide. (17.1 g KI) / (166.00277 g KI/mol) x (1 mol PbI2 / 2 mol KI) x (461.0089 g PbI2/mol) = 23.7 g PbI2 Carbon C = 2 × 12.0107 g/mol = 24.0214 g/mol, Hydrogen H = 4 × 1.00794 g/mol = 4.03176 g/mol, Oxygen O = 2 × 15.9994 g/mol = 31.9988 g/mol, Molar mass = 24.0214 + 4.03176 + 31.9988 = 60.05196 g/mol. 2) We are given 30.0 g of KI. This is how to calculate molar mass (average molecular weight), which is based on isotropically weighted averages. Consider the balanced equation of KI (molar mass=166.0 g/mol) reacting with Pb (NO3)2to form a precipitate. A common request on this site is to convert grams to moles. The atomic weights used on this site come from NIST, the National Institute of Standards and Technology. This is defined as 0.001 kilogram per mole, or 1 gram per mole. It is colourless to white, it appears as cubical crystals, or powder or white granules. 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