Question

classify each reaction as a combination

LAKLI 1. How many moles CH3OH are in 14.8 g CHOW? 2. How many molecules of Co, are in 120 g 00:2 3. Given the balanced equation: 2 NzH4 + N2040 3 Na + 4H20 a) How many moles of dinitrogen tetrahydride are required to produce 57 moles of nitrogen? b) How many moles of dinitrogen tetroxide are required to produce 57 moles of nitrogen? c) How many moles of water are produced when 57 moles of nitrogen are made? KCIO: - KCI + 02 4 How many grams of Oz will be formed from 3.76 grams of KCIO3

Answer 1

Gven 14.8 Mas oC OH (W) 12 4(H) 16(O) Mola mass oCH30 (M) - 32 gmole No of moles of (Ha0H (n) 4.89 32 gmoe O. 46 mole Am Mas o C02 () Molasr mass of (02 (M) - 44 gmole No- of moles of (02(n) 12 44 mole 0. 273 mole Ans

2 N2H4 ()+ 3N2 (8) 4 H20 (g) N204 2 role N2H4 3 mde oN2 give 57 mol 6N wil .x 54 mole N04 1 nequtre 38 mol Na04 11 3 mol N2 04 i uoduce 5a mole Ng mole 3 mole ob N2 gi ves Nj04 Sa mole hill N2 3 quire& -19 mole N204 Gnungth balanted hemical equahion when 57 madas N2 produced 38 N2 H4 tI NE 57 N2G) +76H20 From the given quahon it is deco tha mole 1 molk N204 gives H20 4 23 mole N04 19 X4 mol H20 glve 16 mole H20

02 (3) No of males of ku03 ( 3.76 9 102.5 gmole = 0.036 mole Sinte imale kuo3 1 mole 0 0 036 msle kd03 Ix 0-0376 mole 02 Thus males 02 produced 0.036 male no Henie me 아 02 masy = 0 o 36 x 32 9mg obtaihed AM