If a sample initially contains 100 g of a radioactive isotope, how much will be left after 3 half lives? question 1 options: 50 g 25 g 12.5 g 6.25 g

Great amounts of electromagnetic energy from our sun and other bodies in space travel through space. which is a logical conclusion about these electromagnetic waves? their energy must be very their frequency must be very low these waves can travel without a medium they only travel through a vacuum of space

Which sample at stp has the same number of atoms as 18 liters of ne at stp

Scientists are often interested in knowing the molar heat of combustion – the heat released during the combustion of one mole of a substance. use the periodic table to find molar masses. how many moles of ethanol are present in the sample?