Question

Student Number Soichiometry II Mass-Volume Calculations Lat Volume-Volume Calculations Part I: Mass - Volume 1. How many grams of sodium water? y grams of sodium metal are needed to generate 4.00 L of hydrogen (at STP) from What volume of hydrogen at 20°C and 800. mm Hg will be formed by the reaction of 20.0 g of calcium with an excess of hydrochloric acid 3. When water is decomposed by electrolysis, what volume of oxygen 25°C and 750. mm Hg is produced when 1.25 g of hydrogen is formed? 4. What mass of magnesium must be reacted with hydrochloric acid to obtain 750 mL of hydrogen at 25 °C and 755. mm Hg?

Answer 1

i) Balance becichon is 2nd + 2 Hgo — 2NaOH + Ha At STP, 1 mol Of Hg = 2204 lit. i 4.00 L Ha cordesponds to 4 x)) mol Hy 22:47 = 0.178 mol H2. AS peo deacon 2 mol No poo duce 1 mol H2 :: foo 0.178 mol Hq ,we oequire 10-178 X2) rol Na. : 0.357 pol Na 22.984E8.207 g Na Imol na 27 Ca + 2HCl - CaCl2 + H2. 20.0 g Ga 1 mol CO - 0.499 pool Ga. 40.078 , ca 1 mol ca pooduce 1 mol Ha 4.0.499 Mol ca cowd pooduce 0.499 Mol Hy ! pw = DRT. VE DRT 0.499 X 0.08206 X 293 S . 1.0526 NE 11139.1 şi mmHg= 0.001315 atm } 39 2 H2O → 2 H2 +02 { con voot mm Hg 10 any 1.25 g Hal Imol H2 0.605 mol Hg 1 mol 02 is pooduce along with 2 mol H2 :foo 0.625 mol H2, we ecpect ( * *0.629) mol og = '0.3125 mol O2 RT 0.3125 X0.08206 X 298 7.75 L 0g 0.986 att

A> mg + 2 HGL = MgCl2 + H2. py-DR na pw = 0.006578 atm x 0.750 L 0.08206 Latm.gogik x 298 R. Dcmol of H2) = 2.017 X1094 mol H2 RT * 298 K AS. Per Deacon, I pol mg zea poodluce 1 mol H2 in Foo 2017 Xiós mol H2, we oequired 2.017x1ős mol mg 2.019X164 mol mg 24-3058 - 10.0049 g mg] Timol mg