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a ‘coffee cup’ calorimeter. The temperature of the water after dissolution is 28.97 °C. Calculate the standard enthalpy of solution of CaCl2 (in kJ mol –1). The density of water at 27.0 °C is 0.997 g mL –1 and its heat capacity is 4.184 J K –1 g–1. Ignore the heat capacity of the CaCl 2. Marks 3 The mass of 100.0 mL of water is:
We wish to find the mass of 500 mL of water. Now we already know density if the water is 1 gram/ml. we will use the formula mass density volume to find the mass of 500 ml volume of water.
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To prepare a "10%(w/w) NaCl" solution, mass out "10 g" "NaCl" and place it in a "100-mL" volumetric flask. Add about "80 mL" of water to the flask. Once the "NaCl" has dissolved, add more water up to the "100-mL" mark. If you don't have a volumetric flask, you can use a "100-mL" graduated cylinder, but it won't be as accurate.
11) A wooden object has a mass of 10.782 g and occupies a volume of 13.72 mL. What is the density of the object determined to an appropriate number of significant figures? A) 8 x 10-1 g/mL B) 7.9 x 10-1 g/mL C) 7.86 x 10-1 g/mL D) 7.859 x 10-1 g/mL E) 7.8586 x 10-1 g/mL 12) The number with the most significant zeros is _____.
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32. Calculate the molality of a 15.0% by mass solution of MgCl. 2. in H. 2. O. The density of this solution is 1.127 g/mL. A) 0.157 m B) 11.8 m C) 1.86 m D) 0.0134 m E) 1.58 m 33. A 100.-mL sample of water is taken from the Pacific Ocean, and the water is allowed to evaporate. The salts that remain (mostly NaCl) have a mass of 3.85 g. Calculate the
Jan 05, 2018 · Use an analytical balance to measure the mass of the beaker that now contains 5 mL of water. Remember to zero the balance before you use it. Record the mass in Table 1. 2. Measure the density of 50 mL of water with a graduated cylinder. Use an analytical balance to measure the mass of an empty, dry 50 mL beaker or Erlenmeyer flask.