Figure 10-3 Using Tables and Graphs If an initial sample contains 48 g of thorium-234, how much of the product isotope (not the thorium) will be present after 72.3 days?

What is the molar mass of a gas that has density of 2.054 g/l

Determine the ph of 0.10 m nh3 solution. nh3 is a weak base with a kb equal to 1.8 x 10-5 round answer to nearest whole number.

Which of the following statements is true about energy quantization at the atomic level? electrons in the outermost orbits are the most stable. electrons in all the orbits around the nucleus have the same amount of energy. electrons in the orbit closest to the nucleus have the least amount of energy. electrons absorb or release the same amount of energy independent of the energy levels.