Density measurements were conducted on a 22.5oc sample of water which had a theoretical density of 0.997655 g/ml. a volume of 10.00 ml of the water had a mass of 9.98 g. a volume of 15.00 ml of the water had a mass of 15.61 g. a volume of 25.00 ml of the water had a mass of 25.65 g. (1) show the calculation of the density of each volume. (2) show the calculation of the average density. (3) show the calculation of the percent error based on the theoretical density of 0.997655 g/ml.

Let's divide the three experiments: The experiment with 10.00 mL of water is A), the experiment with 15.00 mL is B), and the experiment with 25.00 mL is C).

%error=

%error=

%error=2.44 %

1. 1 mole of anything contains 6.022x10^23 pieces  

d  

2. a  

3. c, number  

5. 1.24x10^24atoms / 6.022x10^23atoms/mole = 2moles h2 atoms  

6. fe2br3 mass = 2moles x mass fe + 3 moles x mass br  

molar mass = grams / number of moles = g/mole  

to find moles = g / molar mass  

to find mass = g = molar mass / moles