Worksheet Ch.3: % Composition, Molarity, and Other Units for Concentration
% Composition
1. Calculating % composition by mass (using experimental data)
a) A 3.65 g sample of NaF is found to consist of 2.00 g of Na and 1.65 g of F. Calculate
the percentage by mass (percentage composition).
b) A sample with a mass of 48.72 g is found to contain 32.69 g of zinc and the rest is
sulfur. What is the percentage composition?

Darla claims that the first periodic table developed by mendeleev was not completely accurate, so it is not useful at all. harmony argues that it establish the periodic table we use today, making it more credible. who is correct and why? darla is correct, because a model that has any mistakes should be thrown out. darla is correct, because a good model would not need to change. harmony is correct, because mendeleev’s model had all of the information correct in the first version. harmony is correct, because mendeleev’s model made predictions that came true.

Connect the whole numbers on the periodic table to indicate what they represent?

The goal of this experiment was to answer the question "what is the effect of a gas' temperature on its volume? " you formulated the hypothesis below. hypothesis: if a fixed amount of gas is heated, then the volume will increase because the heat will cause the molecules of gas to move faster and further apart. to test this hypothesis, you changed the of the gas between 0 and 100°c (273 and 373 k) and calculated the resulting of the gas.