# how to calculate the percentage of oxygen in magnesium oxide

2.4/24.3 moles of Mg. Favorite Answer. Answer. ? First of all, we just proved that no matter what the mass is, every time oxygen combines with magnesium to form Magnesium oxide, the percentage composition of both elements will stay same. Similarly, how do you calculate the mass of oxygen that reacts with magnesium? Now reduce to lowest terms: 2 / 5 or .4 and multiply by 100. 1 decade ago. Magnesium Oxide When magnesium and oxygen are heated together, they readily undergo a chemical change (reaction): magnesium + oxygen à magnesium oxide (Rxn.1) From the masses of magnesium and oxygen that combine, we can calculate the empirical formula of magnesium oxide. The equation is: Magnesium + oxygen → magnesium oxide; 2Mg + O 2 → 2MgO This should allow them to calculate the mass of the mass of the magnesium (mass 2 – mass 1) and the mass of the product (mass 3 – mass 1). To understand why experiments do not always produce a percentage yield of 100% 3. Method: Weigh a crucible and lid; Place the magnesium ribbon in the crucible, replace the lid, and reweigh; Calculate the mass of magnesium The chief was seen coughing and not wearing a mask. How do you predict the formula of magnesium oxide, and also its percent composition (theoretical yield) Answer Save. Magnesium metal reacts with oxygen from the atmosphere in a combustion reaction to produce grey-white solid magnesium oxide. Suppose 2.033 g of magnesium is heated in the air. The Mg-O 2 reaction is energetic enough to allow some Mg to react with gaseous N 2. 2.4/ molar mass of Mg = the number of moles of reactant you get since It is a one to one ratio in this problem. The result showed that Magnesium oxide formed through chemical reaction was made up of 60.19% magnesium and 39.81% oxygen, ... Purpose: To determine the percent magnesium by mass in magnesium oxide and to observe if the percentage composition is constant by comparing class results. Both Mg and O have 2 valences. Calculate the percent composition of the magnesium oxide product. Relevance. Synthesis of magnesium oxide and calculation of percentage yield Percent by mass of O = 16 / 40. Hypothesis Based on the law of definite proportions it is hypothesized that the percentage composition of magnesium oxide will be 60.3% magnesium, and 39.7% oxygen. What mass of oxygen is in the molecule? the formula for magnesium oxide is MgO and the molar mass of the compound is 40.3 g/mol. Oxygen = 1.98/16 = 0.123. Calculate the mass of oxygen needed to react 50 g of magnesium to form magnesium oxide. Relative masses: Mg = 24, O = 16, MgO = 40 Example of calculation. Other way, if some of the Magnesium oxide has escaped it would have been escaped in … Example: When magnesium is burned in air, it reacts with oxygen (O 2) to form magnesium oxide (MgO). Calculate the percentage water of crystallisation in magnesium sulfate crystals, MgSO 4.7H 2 O, known as Epsom salt. Lv 7. Calculate the amount of K O H required to prepare 100 mL of 0.1 M solution. In this lab, magnesium metal (an element) is oxidized by oxygen gas to magnesium oxide (a compound). To consider the importance of percentage yield to an industrial chemist . 3/24 = 0.125. They could also calculate the increase in mass (mass 3 – mass 2), which corresponds to the mass of oxygen. 16 / 40 x 100% = ((40%)). magnesium + oxygen gas → magnesium oxide Since the product, magnesium oxide, contains only magnesium "atoms" and oxygen "atoms" (1), we could write the formula Mg x O y in which: x represents the number of Mg "atoms" Answer. From the data, it is possible to calculate the masses of magnesium, oxygen, and magnesium oxide and use this information to determine the percent composition of the compound. The reaction of magnesium with oxygen occurs relatively slowly, so a Bunsen burner will be used to enable the reaction to take place more quickly. Magnesium reacts with oxygen to produce magnesium oxide: 2Mg(s) + O2(g) $$\rightarrow$$ 2MgO(s) Calculate the mass of magnesium needed to produce 12.1g of magnesium oxide. The general equation for this reaction is: metal + oxygen → metal oxide. Hypothesis: Based on the law of definite proportions, the percentage composition of magnesium oxide should be around 60% magnesium and 40% oxygen. By careful weighing of the mass of product and comparison with the initial mass of the metal, the oxygen content in the product may be determined and hence the empirical formula of the metal oxide formed. We are told that 24 g of Mg produces 40 g of MgO when it reacts with 16 g of oxygen.