Question

24. Balance the equation below using the smallest set of whole numbers. What is the coefficient of H2O? __PC(O) +_HO(1) ►_H3PO3(aq) + HCl(aq) A) 1 B) 2 C) 3 D) 5 E) none of these 25. How many atoms are in 5.54 g of F? A) 6.02 x 10- atoms B) 0.146 atoms C) 0.292 atoms D) 8.78 x 10" atoms E) 1.76 x 10" atoms silicon atoms is 26. The mass of 1.63 x 10 A) 2.71 x 10- g. B) 4.58 x 10g. C) 28.08 g. D) 1.04 x 109 g. E) 7.60 x 10 g. 27. How many grams of sulfur are there in 6.0 g of Fe2(SO4)3? A) 2.40 g B) 0.48 g C) 6.00 g D) 0.92 g E) 1.44 g

Answer 1

The complete step wise calculation is given as below:-

(24 reaction is the given complete balanced as below:- PCl3 + 3H2O 4T 3HCl cast H3PO3 (99 0 so, the coefficient of H2O =3 Then the correct option will be © 3.

(25 mass of Fq = 5.54g molecular weight of Fq = 38 g/mol Number of moles af F2 = 5.549 -0.146 moles 38 g/mol since, mole = 6.023 X 10 23 atoms Then 0.146 moles = 0,146 X 6.023X1023 atoms =0.879 X1023 atoms or Number af atoms = 8.79 x 1022 atoms. So, the correct option will be 8.78 xlo22 atoms.

(2 molecular weight af si = 28 g/mol I mole = 6.023 x 1023 atoms af silicon. So, 6.023 81023 atoms = 289 Then 1.63x16 21 atoms = 28x163x1021 g g 1023x102t- 2.3 6.023x1023 = 45.64 45,64 6.023X102 602.3 = 0.0758 g = 7.58x102g since, mass of si = 7.58 x102g. Then the correct option will be € 7.60 810-2g.

(27 mass of Feq (sou) 3 = 60g molecular weight of Feq(SO4)₂ = 400 g/mol Number of moles af Fer (SO4)3 = 69 00015 mol Yooglmol since, Imole af Fe2(SO4)3 Contains 0.015 moles Then the number of moles of s= 3x0.015=0.045 mol molecular weight afs=16*2 = 32 gimol mass of sulfur = (0.ous mol) x (32 g/mof)= linug So, the correct option will be © 1,44g.