How many moles are there in 987 grams of ra(oh)2? id also love to know the simplest equation for converting moles --> so i could practice on my own : )

If the density of water is 1.0 g/cm3, which of these materials would float in water, based on their densities? check all that apply. aluminum cork iron lead wax

1) which of the following is the best example of a physical change? a) sugar dissolving in tea b) firefly glowing 2) in the combustion of ethane, what is/are the reactants? c2h6 + o2 ==> co2 + h2o a) c2h6 and o2 b) co2 and c2h6

What is the ph of a solution that has a hydrogen ion concentration of 1.0 * 10 -9 m?