![]() How many moles are present in 57.68 g of calcium nitrite?. ![]() Which of the following represents 0.219 mol?a) 2.00 g of H2Ob) 75.57 g of KBrc) 100 g of KClO4d) 8.76 g of NaOH.Therefore, 17.0 g of H2O2 corresponds to 0.5 mol. 25.0 g of KMnO4 represents 0.158 mol.Įxample 5 Calculate how many moles are in 17.0 g of H2O2. Step three: You divide the grams given by the substance's molar mass:The answer is 25.0 g / 158.034 g/mol = 0.158 mol. The molar mass of KMnO4 is 158.034 g/mol. Step two: You need to know the molar mass of the substance. Step one: The question will tell you how many grams are present. Įxample 4 Convert 25.0 g of KMnO4 to moles. Determine how many grams are given in the problem.Mole Conversions: Converting Grams to Moles Three steps to converting moles of a substance to grams: What is the mass of 3.40 x 10-2 mol of Na2CO3?.If you had 1.5 mol of each of the following compounds, which would have a mass of 135.8 g?a) H2O2b) H2SO4c) KClOd) MgCl2.2.50 mol is given in the problem.MM (KClO3) = 122.55 g/mol (the combined mass of 1 K, 1 Cl and 3 O atoms) 2.5 mol x 122.55 g/mol = 306.375 g There are 306.38 g in 2.5 mol of KClO3 The molar mass of H2O2 is 34.0146 g/mol Step three: You multiply the mol given by the substance's molar mass:0.7 mole x 34.0146 g/mol = 23.8 g So, there are 23.8 g in 0.7 mol of H2O2Įxample 3 Convert 2.5 mol of KClO3 to grams. In this question, 0.7 mol are given Step two: You need to know the molar mass of the substance hydrogen peroxide contains 2 H and 2 O atoms in each molecule. Look for the word "mole" or the unit "mol." The number immediately preceding it will be how many moles. Step one: The problem will tell you how many moles are present. Įxample 2 Calculate how many grams are in 0.7 mol of H2O2 (hydrogen peroxide which is used to sterilize wounds). Calculate the molar mass of the substance.Determine how many moles are given in the problem.Mole Conversions: Converting moles to grams Three steps to converting moles of a substance to grams: What is the molar mass of aluminum sulphate?.Which of the following chemical formulas has a molar mass of 34.0146 g/mol?a) H2Ob) H2O2c) HO2d) CH2O.For the entire molecule:26.9815 + 42.0201 + 143.9946 = 212.9962 g/mol The molar mass of aluminum nitrate is 212.996 g/molNote: The decimal places of the answer are consistent with the decimal places in the atomic masses, your periodic table might be less precise (less decimals).The atomic mass of Al is 26.9815 g/molThe atomic mass of N is 14.0067 g/molThe atomic mass of O is 15.9994 g/mol.There is 1 atom of AlThere are 3 atoms of NThere are 9 atoms of O.Add the results of step three together.Įxample Tip: It is best to carry all of the available decimal places, and round only the final answer to the appropriate decimal place.Multiply step one times step two for each element.Look up the atomic mass of each element in a periodic table. ![]()
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