5. percent by mass of oxygen in CaO. Answer: The percentage of Alumina, Potassium oxide and Silica in the sample is 18.3 , 16.9 and 64.6 respectively. The mass of potassium reacted here is 160 (4×40)atm and that of oxygen is 32(2×16) atm. 2 Answers. 48.4. 1963]. Relevance. Convert grams K2O to moles or moles K2O to grams. Then multiply 100. The previous answer (Bailey) is on the right track but has made a couple of errors. However, reactive metals like Na and K will often react to form other oxide species. 145g of Potassium Oxide ( K2O )contains a mass of 24.6279566g of Oxygen ( O )& a mass of 120.3705041g of Potassium ( K )24.6279566g O + 120.3705041g K2 = 144.9984607g K2O * Potassium Oxide â¦ Percent by mass of O = 16 / 40. Examples of molar mass computations: NaCl, Ca(OH)2, K4[Fe(CN)6], CuSO4*5H2O, water, nitric acid, potassium permanganate, ethanol, fructose. A 500. gram iron ore sample was determined to contain 242 grams of iron. 4K + O2 -> 2 K2O. 3:1559. Molecular weight calculation: 39.0983*2 + 15.9994 âºâº Percent composition by element 17.0. CAMEO Chemicals 8.8 â¦ It is abbreviated as w/w%. Percent Composition Calculator. 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 higher oxides of potassium, formed in air, react explosively with pure potassium, sodium, sodium-potassium alloys, and organic matter [Mellor 2, Supp. Answer Save. What mass of potassium oxide is formed when 9.75g of potassium is burned in oxygen? 1 mole of oxygen gas produced is from 2 moles of potassium oxide. The percent composition can be found by dividing the mass of each component by total mass. The whole solution is : first see the balanced equation of this reaction: 4K+ O^2= 2K^2O . You then calculate percentage composition of K through mass. the amoumt of potassium oxide obained will be 9.36 gram. What is the mass percent of oxygen in potassium oxide? Chemmunicator. 1 decade ago. For a solution, mass percent equals the mass of an element in one mole of the compound divided by the molar mass of the compound, multiplied by 100%. What is the mass percent of carbon in oxalic acid, H2C2O4? This compound is also known as Potassium Oxide. Favourite answer. Sodium in oxygen tends to form sodium peroxide, Na2O2 in addition to Na2O, and potassium in oxygen tends to form potassium superoxide, KO2 (not dioxide, as this implies a 2- charge for the O), peroxide, and maybe some oxide. equation: mass of K divided by mass of K2O. Molar mass of K2O = 94.196 g/mol. Thank you. What is the mass percent of iron in the ore? 17.0 94.2 41.5 83.0 none of the above Mass percent composition is also known percent by weight. The percent composition is used to describe the percentage of each element in a compound. The mass percent reveals the proportion by mass of an element in a compound. Mass percent composition describes the relative quantities of elements in a chemical compound. 2. percent by mass of oxygen in SrO. 26.7. Can you calculate this quantity for oxygen in potassium oxide (K20)? Lv 5. To calculate composition of O you have to rely on the equation. Explanation: In , alumina has 2 aluminium atoms and 3 oxygen atoms, silica has 6 silicon atoms and 12 oxygen atoms and potassium oxide has 2 potassium atoms and 1 oxygen atom.. To calculate the mass percent of compounds, we use the formula: 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. 19.55/23.55= 0.8301. multiply 0.8301 by 100 to get the percentage which is 83.01%. 16.9 and 64.6 respectively 64.6 respectively of an element in a compound iron ore sample was to. 160 ( 4×40 ) atm ( 2×16 ) atm of one element 's mass or to! 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