Question

Homework #7A Name: Due date: 3-16-20 1. How many moles of water, H20, contain 9.03 * 10molecules of water? 2. How many molecules are present in 4.9 moles of L,CO3. 3. How many moles of oxygen are present in 4.9 moles of L.COM 4. How many Li atoms are in 4.5 moles of Li? 5. Calculate the mass, in grams, for 3.75 10 molecules of C2Hs. 6. Calculate the mass, in grams, for 3.5 moles of CHO. 7. Calculate the molar mass for each of the following. a. FeSO, iron supplement) b. A1,0, (absorbent and abrasive) e. C H NO,S (saccharin) d. C,H,O (rubbing alcohol) e. (NH).CO, (baking powder) 8. Ammonia is produced by the chemical reaction of hydrogen and nitrogen Nz(e) + 3H:(8) 2NH3(g) a. How many moles of Hz are needed to react with 1.0 mole of Nz? b. How many moles of N2 reacted if 0.60 mole of NH, is produced? c. How many moles of NH3 are produced when 1.4 moles of H2 reacted?

Answer 1

1 mole of water contain molecules of water = 6.022 x 1023 i e 6.022 x 10 molecule of H₂O = 1 mole 24. 9.03 x 10 2 molecule of H₂0= 1 x 9.03x10²4 6.022 x 1023 = 14,99 moles 2 1 mole of Lizcoz = 6.022 x 1023 molecules 4.9 moles of Li, co z = 4.9 x 6.022 x 1023 molecules = 2.95 x 1024 molecules 3 1 mole of coz contain mole of Oxygen = 3 4.9 moles of Liz Coa contain moles of = oxygen 3 * 4.9 = 14.7 moles ng ① & mole of si = 6.622 x 1023 atoms. 4.5 moles of i= 4.5% 6.022 x 1023 atoms = 27x10 23 atoms.

G 6.622 x 102s molecules of C2H5 = 29 grams 3.75 X 1023 min molecules of c245= 29 x 3.75 6.622 10 = 18.058 9. I mole of C₂4, 0₂ = 3(12) + 6(1) + 3(16) = 96 gram. 3-5 mole of C3H6O3 = 3.5896 = 336 gram a) reso y = 55.8 + 32.1 +4(16) = 151.9 grem/mod. Al2O3 = 2(27) + 3(16) = 102 g/mol 6 . Cz Hg Nozs = 7(12) + 5 (1) +1(14) + 3 (16) + 1(321) = 183.1 g/mol. C3480 = 3612) +811+ 16 = 60 g/mol. - e) (NH 4 ) ₂ coz = 2(14)+B(1) + 1 (12) + 3(16) = 96 g/mol.