What is the difference between stable and unstable isotopes

What is the number of moles in 15.0 g ash3?

Calculate the estimated density of each ball. use the formula d = m/v where d is the density, m is the mass, and v is the volume. record your calculations in table a of your student guide. given that the density of water is 1.0 g/cm3, make a prediction about whether each ball will float in water. record your prediction in table a. what is the estimated density of the table tennis ball? record your answer to the nearest hundredth

+= + + balance the equation on coefficients, ex. 1,1,1