Question

For each of the reactions, calculate the mass (in grams) of the product formed when 15.46 g of the BOLD reactant completely reacts. Assume that there is more than enough of the other reactant. Express your answer using four significant figures.

Part A

2K(s)+Cl2(g)––––––→2KCl(s)

Answer: m= ? g

Part B.
2K(s)+Br2(l)––––––→2KBr(s)

Answer: m= ? g

Part C

4Cr(s)+3O2(g)––––––→2Cr2O3(s)

Answer: m= ? g

Part D

2Sr(s)–––––+O2(g)→2SrO(s)

Answer: m= ? g

Answer 1

. Heil in fant At A. Q k(s) + la cgl – - QKCl (s) Potassium Chlorine Peotassium chronite In all parts other rendere . Given wt. of k=15.46 gm is more than enouge. so no. of Moles = Given wt. Atomie wit of k=39.098? games - Atomic wtork) . = 15.46gm = 0.395 mol of k 39.0989 9๒ ๒๐) & moles of potassium froduce = a mole of kel 0.395 mola of k will foredue = 0.395 mole of ker so wt. of kol produced = No. of moles x Atomic wit of kee = 0.395 male x 94.5513 glmos = 29.478 gma Round off uprte u significent figures = 29.48 gm akcsi + Bracel - 24By (5) potassium Bromine 1 Potassium tremite Given wit of k= 15.46 gm so no. of moles = Given wt Atomic wt. = 15:46 gm 39.0983.9mimos (Atomie lot of K) = 0.395 mol of k 2 mole of potassium produce =.amole of kBr 0.395 moles of k priduce = 0.395 mol of kBr as Scanned with CamScanner

so weight & KBr produced= No.d moles y Atomic wit d kBr = 0.395 mol x 119.0 glmes = 47.005 gm Round off up to a significant figures = 47.01 gm Part Ca ueros + 70g (ol - arra og(s) Chromium Oxygen chromium oxite Weight of chromium = 15.40 gm so no. of Moles of chromium = Given wil 1 Atomie wt of cr – 15.46 gt Sl. 4961 gm Imol = 0.0297 mol i mel of cr produca 2 mol of Crooz 0.297 mel of er will produ= 2x0.297 mol of cr , o -0.1465 mol so wt of croos produced = no. of moles y atomic wt of Creo = 0.1465 mol x 151.99 gitter = 202.5705 gm Round off up to 4 significant figures = 22.579m Putno . a srisi & Q (g) - asrors) a strinitum oxygen Strontium oxide Scanned with CamScanner

Oh m 11C cl weight of strontium= 15.469m So. no. of Moles of sr= Given will Atomic wt of Sr = | S. 93 9% 87.62 grimas = 0.1774 mol amol of sr froduce t o mal of sro so 0.1784 mel of sr froduce = 0.1764 mal of sro so wt of sto foroduced = hoof Molax atomic wit of sro -0.1964 mapa x 103.6 Olmos = 18.2795 gm Round off upto 4 significent figures = 18.28gm Scanned with CamScanner