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What is the empirical formula for the compound that contains 49.4 % K, 20.3% S, and 30.3 % O by mass?

How many oxygen atoms are there in 30 molecules of C20H42S3O2?

Consider the phase diagram below for CO2.  Which of the following statements is false?

The element, Mikium (Mi), named after the CHM 113 Discussion Leader who discovered it while working at ASU, has three naturally occurring isotopes. The masses and % natural abundances of these isotopes are shown in the table below: What mass should be listed on the periodic table for this element?

Which of the following elements has the highest electronegativity (EN)?

Consider the following reaction: C3H8 + O2 → CO2 + H2O If 10.0 g of C3H8 were allowed to react with 10.0 g of O2, how many grams of CO2 would be produced?

Silver nitrate and aluminum chloride react with each other by exchanging anions: 3 AgNO3 (aq) + AlCl3 (aq)

In which of the following ions are the bond lengths expected to be the shortest?

A sample of CaCO3(s) absorbs 40.3 J of heat, causing its temperatures to increase from 20.8 ºC to 27.3 ºC.  If the specific heat of CaCO3 (s) is 0.82 J/gK, what is the mass of the sample (in grams)?

Which of the following compounds contains pure covalent bonds?