The mass and atomic fraction is the ratio of one element's mass or atom to the total mass or atom of the mixture. The percent composition is used to describe the percentage of each element in a compound. Assume a 100-g sample of ascorbic acid. Molar Mass: 159.2086 Other percentage mass composition calculations including % of any component in a compound or a mixture. What is the percentage by mass of chlorine in magnesium chlorate, Mg(ClO3)2? For instance, if you had a 80.0 g sample of a compound that was 20.0 g element X and 60.0 g element y then the percent composition of each element would be: Your car burns mostly octane, C 8 H 18, as a fuel. 4b. The Mg-O 2 reaction is energetic enough to allow some Mg to react with gaseous N 2. ››More information on molar mass and molecular weight. I was just wondering if some body could balance the equation- the formula is . Percent composition in chemistry typically refers to the percent each element is of the compound's total mass.. The percent composition can be found by dividing the mass of each component by total mass. Computing molecular weight (molecular mass) The Merck Index is the definitive reference work for scientists and professionals looking for authoritative information on chemicals, drugs and biologicals. Relevance. Answer Save. Magnesium reacts vigorously when heated in the presence of air. Mg(ClO3)2 turns into MgCl2 + O2. Thanks and have a good day! How much strontium bromide is needed to add to chlorine gas to produce 75 liters of bromine? Atomic masses used for 4b. Percent Composition Calculator. Calculate the number of moles of Cl atoms in 1.81×1024 formula units of magnesium chloride, MgCl2. 9 years ago. questions: C = 12, Cl = 35.5, Fe = 56, H = 1, Mg = 24, N = 14, Na = 23, O = 16, S = 32, By now I assume you can do formula mass calculations and read formula without any trouble, so ALL the detail of such calculations is NOT shown, just the bare essentials! Molar mass calculator also displays common compound name, Hill formula, elemental composition, mass percent composition, atomic percent compositions and allows to convert from weight to number of moles and vice versa. What mass of ammonium chlorate is needed to decompose to give off 200 liters of oxygen? Can you balance the equation- Magnesium Chlorate is decomposed by heating into magnesium chloride and oxygen? How much (grams) magnesium hydroxide do you need to use in the above reaction to produce 500 liters of ammonia? Kisamaria. Although there is a higher percentage of N 2 gas in the atmosphere than O 2, O 2 is more reactive and the magnesium oxide forms in a greater amount than the nitride. Ascorbic acid (vitamin C) contains 40.92% carbon, 4.58% hydrogen, and 54.50% oxygen by mass. The basic equation = mass of element / mass of compound X 100%. 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