How many oxygen atoms are there in 32.8 g of Na2SO4?

Which compound below has an empirical formula of CH?

What type of matter is composed of multiple components with a uniform composition?

Given the data in the table below, what is ∆Hºrxn for the following process? IF5 (g)  +  F2 (g)  →  IF7 (g)

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

Which of the following compounds does not share the same empirical formula as C6H12O6?

Consider the phase diagram below for the noble gas, neon: According to this diagram, what is the approximate normal melting point of Ne?

For which of the following reactions is ∆Hºrxn equal to the heat of formation (∆Hºf ) of the product?

Sodium carbonate reacts with silver nitrate according to the following balanced equation:                         Na2CO3 (s) + 2 AgNO3 (aq)

A cube of unknown metal with a mass of 36 mg measures 1.61 mm on one side. According toTable 1, what is the most likely identity of the metal?**