Question

s sodum phosphate =) 0.25 X 162 moc acid & 0.25X6.3.01 = 0.25 * 163.94 = 41.69 6.3.01 = 15.89 scular Weight and Percent Compositon and all Molecular weights to one place pass Problem Set #19 - Moles, Molecules, Molecular Weight Give all answers in three significant figures and all Molecule the decimal 1. Give the molecular weight (molar mass) for each of the following a. sodium phosphate — 1649 ole b. nitric acid - 63.0lmol- c. barium arsenate 690 zole d. dinitrogen tetraoxide- 12 cold e. magnesium sulfate heptahydrate- 246 2. Aspartame, the artificial sweetener has a molecular formula of CH3N20 answer the following questions about the compound. a. What is the molar mass-294.35 male b. How many moles are present in 75.8 grams of the compound S y c. What is the mass of .735 grams of the compound 429 - Ima d. How many Hydrogen atoms are present in 8.22 mg of the compound 1584 3. 495 grams is a typical mass for a glass of water. Calculate the number of water molecules you drink when quenching your thirst with this quantity of our most common liquid. please Le do 4. How many moles are in 150 grams of each of the compounds in problem #1? 5. How many grams are need to give .250 moles of each of the compounds in oblem #17 0. What is the percent weight of oxygen in barium chlorate? chlorate?Ba| cloz)2 =304.2 ur in sodium sulfitelper mass of ADS, 79lm OXL00% What is the percent weight of sulfur in sodium sulfite? 3423148. What is the percent weight of water in magnesium sulfate heptahydrate 31.6% sulfure 232.065 7100% = 25.4%) 121.0427 Indar mass of magneron sulfate hepthe ale heptshydral 24616

Answer 1

solution ③ mass of water = 495 g molar mass of 120 = 18 g/mol. . moles of 420 = mass of 420 molar mass of 420 a u95 g - 18 g/mol = 27.5 mole mole of H20 contains 6:02X10" molecules of 420. - 23 27.5 mole of 420 contains .27.5 X 602X10 3 = 165.55X10?? = 1.65 x1025 molecules 7 420, solution 9 for sodium sulphate phosphate molar mass of sochiuri fulphate phosphate Nasoy Naz pay = 164 g/mol. mass of Naz pon = 150 g moles = mass molar mass = 150 g = 0.9146 male mass 164 g/mol = 0.9146 mali Therefore moles of Naz poy in 150 pre moles of Nazpoy in 150 g of compound is 0.9146 similarly do for other compounds s Scanned with CamScanner

PAAR solution ③ mols = 0.250 o mele no for sodium phosphate modes of sodium phosphate = 0.950 mele o the mass mol = molar mass mass = mol x molap mais mass of Nazpon = 0.250 X 164g I medo = 44100 g similarly calculate for other compounds, solution 6 Barium chlorate Ba (2003) molar mats of Ba (103)₂ = 304.23 g/mol ох, аhоn in B4 (001), = 3х2 = 6 mass of 6 oxygen = 6X16=96g % weight of oxygen = mass of oxygen X100 mars of compound 96 xloo = 304.23 31:55%. Scanned with CamScanner

MALL ALLA VALLE solution o Sodium sulphite molar mass of Na250g = 126.0 g/mol Number of sulphur atom in Na2SO3 = 1 . mass of surom = 32g. % weight of s = mass of s -X100 mass of Na 2503 . = 32 x 100 Solution @ 126 = 0.2539 Xiao = 25.39%. My soy.7H2O = 2.46 gl med No of H2o in module = 7 - mass of H20 = 7818 = 126 g/mol -7,420 = 126 X100 246 = 51.22% S Scanned with CañScanner