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

Arrange the following three substances: NO+, NO2-, and NO3- in order of decreasing (largest to smallest) N-O bond length.

Two possible electron-dot structures are shown below for the cyanate ion, NCO-: Which of these Lewis Structures is the most favorable?

How many protons, neutrons, and electrons are there in one ion of 63Cu2+?

The temperature of a 15 g sample of lead metal increases from 22 ºC to 37 ºC upon the addition of 29.0 J of heat. What is the specific heat of lead (in J/gK)?

When calcium carbonate is heated, CO2 (g) is produced according to the following balanced equation: CaCO3 (s) → CaO + CO2 (g) If 5.00 g of CaCO3 (s) is heated, what volume (in L) of CO2 (g) would be produced when collected at a temperature of 27.0 ºC and a pressure of 0.920 atm?

What is the chemical formula of the compound, lead (II) carbonate?

A certain pain medication (the only known legal remedy to enduring a 75 min CHM 113 lecture) is a compound composed entirely of C, H and O. It contains 75.69 % C, 8.80 % H, and 15.51 % O by mass. What is the empirical formula of this compound?

The element Titotium (Tt) was recently discovered in a remote village in Mexico. Tt is composed of two naturally occurring isotopes: 295Tt and 301Tt, with atomic masses of 294.969 and 301.002 g/mol respectively.  295Tt is the most common isotope, with a natural abundance of 63.84%.  Which entry below should be used when Titotium is added to the Periodic Table later this year?

How many moles of potassium ions are there in 15.2 g of the ionic compound, potassium phosphate (K3PO4)?