In clinical applications, the unit ppm (parts per million) is used to express very small concentrations of solute, where 1 ppm is equivalent to 1 mg of solute per 1 L of solution. Calculate the concentration in ppm for each of the following solutions.

a) There are 17 ?g calcium in a total volume of 89 mL.
b) There is 0.65 mg caffeine in a total volume of 131 mL.
c) There is 0.35 mg trace particle in a total volume of 91 dL solution.

150.0 grams of asf3 were reacted with 180.0 g of ccl4 to produce ascl3 and ccl2f2. if the actual yield of ccl2f2 was 127 g, what is the percent yield?

Which of these conditions most likely produces an unstable isotope?

Identify one disadvantage to each of the following models of electron configuration: -dot structures -arrow and line diagrams -written electron configurations type in your answer below. (answer) -dot structures do not show the distribution of electrons in orbitals and take up a lot of space. -arrow and line diagrams take up a lot of space and make it difficult to count electrons. -written configurations make it easy to lose count of electrons and do not show the distribution of electrons in orbitals.