What is the correct order of steps to determine the mass of product created, given a certain mass of reactant?

I. Convert given mass to moles
II. Determine mole ratio between given mass and substance being solved for
III. Balance the equation
IV. Convert moles of substance being solved for to mass

The volume of helium in a blimp is 6.28 x 10^9 millimeters. the density of helium in the blimp is .1786 kilogram/meter^3. find the mass of the helium in the blimp.

What are scientists who study fossils called? ( a ) astronomers. ( b ) biologists. ( c ) geologists. ( d ) paleontologists.

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