Why isn't the atomic mass of most of the elements on the periodic table a whole number?

There are 2 moles of NaCl. How many atoms of NaCl do you have?

A container can hold 65 g of water. Circle the conversion factor needed to find mass of water that 5 identical containers can hold

Star A has a temperature of 9000 K while Star B has a temperature 3000 K. If the two stars are the same size, according to the Stefan-Boltzmann law, how much brighter is star A than star B?

Using the equation below, calculate the number of grams of CO that can react completely with 78.9 g Fe2O3 Fe2O3 (s) + 3CO (g) → 2Fe (s) + 3CO2 (g)

When undergoing chemical reactions where does the reactant combine to the enzyme?

According to the graph, which activity has used the largest amount of water over the past twenty years?

Tiffany leaves balloons filled with helium gas inside her car in on a sunny day when she returns to her car some some of the balloons are much larger and a few have popped explain what happened

If the pH indicator bromothymol blue was added to the nitric acid solution, it's colour would be?

Which statement describes a chemical reaction? Atoms in the products are rearranged to form new substances. Atoms in the reactants are rearranged to form new substances. Atoms in the products change into new atoms to form new substances.

The gases CO₂ (g) and NH₃ (g) can be liquefied at 20°C by compressing them to sufficiently high pressures. A student claims that NH₃ (g) can be liquefied at a lower pressure than CO₂ (g) can be liquefied.