chem102workshop2 - NAMES WORKSHOP 2(30 points Solution and...

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NAMES: ____________________________________________________________ WORKSHOP 2 (30 points) Solution and gases Summer 2010 1. (2 pts) Describe how to make 100.0 mL of a 1.0 M K 2 Cr 2 O 4 solution. n= 1.0 mol/L * 0.1 L= 0.1 mol m= n*MM= 24.6 g We need to dissolve 24.6 g in 100 ml of solution. 2. (3 pts)What would the concentration be if you used 27g of CaCl 2 to make 500. mL of solution? What is the concentration of each ion? M(CaCl 2 ) = ? n= 27 g/ 110 g/mol= 0.245 mol M= 0. 245 mol/ 0.5 mol= 0.49 M CaCl 2 Ca 2+ + 2Cl [ Ca 2+ ] = 0. 49 M [2Cl - ] =1.0M 3. (3 pts) A 5.0 L cylinder contains oxygen gas at 20.0°C and 735 mm Hg. How many grams of oxygen are in the cylinder? P= 735mmHg= 0.967 atm n= PV/RT m= MM*n= 32g/mol * 0.20 mol = 6.4 g
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4. (5 pts) Write the correct order of increasing density for N 2 , NO 2 , NH 3 . The temperature and pressure are same for all three samples. NH 3 , N 2 , NO 2 P,T=constant so d= m/V , m = n*MM, n= PV/RT, d= (PV/RT*MM )/V = (P/RT)* MM , P/RT= constant , so when molar mass is greater the density is greater . so NO 2 has the highest density. 5. (3 pts) What volume of NO can be produced at 1.0 atm and 1000. ºC when 10.0 L of NH 3 and 10.0 L of O 2 are reacted at the same temperature and pressure?
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