A new element, Thorsonium, has two isotopes. Thorsonium isotopes have a mass of 255 amu and 257 amu. Given the average atomic mass of Thorsonium is 255.65 amu, calculate the percent abundance for each Thorsonium isotope.

What is the percentage by mass of silicon (si) in iron aluminum silicate (fe3al2(sio4)3)?

1. calculate the approximate enthalpy of the reaction in joules. estimate that 1.0 ml of vinegar has the same thermal mass as 1.0 ml of water. iqnore the thermal mass of th sodium bicarbonate. note: it takes about 4.2 joules () to change 1.0 gram (1.0ml) of water 1.0 c

Draw the skeletal structures of two different molecules that are each made of 5 carbon atoms and 12 hydrogen atoms.