A metal ball-bearing with a circumference of 46.8 mm weighs 12.9 g. What is the density of the metal in g/cm3 (V of a sphere = (4/3)πr3; circumference of a circle = 2πr)?

Which of the following is a compound? a. carbon b. oxygen c. hydrogen d. water

Is this a single replacement reaction or there is no

Tin has ten stable isotopes. the heaviest, 124sn, makes up 5.80% of naturally occuring tin atoms. how many atoms of 124sn are present in 82.0 g of naturally occurring tin? what is the total mass of the 124sn atoms in this sample?