Question

stoichiometry

5. Paris green is a highly toxic emerald green compound with the form 1 the formula Cu(C,H,O), 3Cu(ASO),. What is its percent by mass arsenic? 6. A gas that is produced when fruit ripens contains 85.62% C and 14 380 mass. The molecular mass was found to be twice the empirical formula 1 molecular mass. What is the molecular formula of this gas? 7. A hydrocarbon molecule contains twice as many hydrogen atoms as carbon atoms. Its molar mass is 84.15 g/mol. What is the molecular formula for the hydrocarbon? 8. When NaHCO3 is heated above 270°C, it decomposes to Na2CO3 (S), H20 (9) and CO2(g) a. Write a balanced chemical equation for the reaction b. Calculate the mass of CO2 produced from the decomposition of 25.0 g of NaHCO3.

Answer 1

please see the attached file for the solution.

Note that the mass of elements, wherever taken are in g/mol units, whether mentioned or not.

5. Melas mars o Paris green 4 Cu 4C + 6H + 16 0+2 A CAS Molas to he addEd Lin g/mal) (4x 63-5)+4(12) 6() 16(16) +G(75 Im) mass each has lo14 /mol 6(75)g/mo) xloD 10149/mol perunt by mass t Arsenic = 44. 38 1 for 6. mole e element element er, gm, assuming 10 gm cempound 85.624 mats element 3/moi) Rah'o of H Name etelement (7-135/2435)1 (4-/2135) 2 C 7.135 12 14.38 14.38 H 14.38 1. 1 :2 CH2 E)Empinical formula Moleular beamla 2xCM) Achylene gas Then, let Carben atoms, be no no Hydrogen atems 12 x) i 84.15

since, molar mass et C12 9/nol and 14 84.15 co f 6.61 Taking uhole number, 2 6 C atems and, H atons = 12 no C6 H12 Formula 8. a) 2Nanco3 Nq ८03 ) 209) (2 76'C) Balanced chemical Aeathon 25 t Now, is heated NaHCO3 mole NaHco3 25 3 25 849/mo) (molar mas Nano molar mass NaHo (23+1+12 +48) 3/mo EB4gImel 11 0 30 Since, 2 mole 1 mole e cO2 Nanco3 iues 0-5 i mole 0.5x0.30- - 0. 30 mole 0.15 mole 0. 15 x44 655 e4 C02 OU ma Co12 t32 44 9/ mo molat Ans wer I t

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