The Cs-131 nuclide has a half-life of 30 years. After 120 years, 3.0 g remain. What is the
original mass of the Cs-131 sample in grams?

In the space, show a correct numerical setup for calculating the number of moles of co2 present in 11 grams of co2

What is the wavelength of a wave with a velocity of 50 m/s and a frequency of 5hz a 250 m b 0.1 m c 10m d 0.01 m

When the ionic compound nabr dissolves in water, br– ions are pulled into solution by the attraction between what two particles? a. the na+ and br– ions b. the na+ ion and the negative end of a water molecule c. the br– ion and the positive end of a water molecule d. the br– ion and the negative end of a water molecule