Complete the following multiplication and division problems in scientific notation. a. (4.8x10^ 5 km)x(2.0*10^ 3 km) (3.33 x10 ^ - 4 m)x(3.00 x 10 ^ - 5 m)

(8.42 x 10 ^ 8 kL) divided by (4.21 x10 ^ 3 kL)

(8.4 x 10 ^ 6 L) divided by (2.4 x 10 ^ - 3 L)

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.

Match the mixture with the substance// i really need on this guys (it’s a pic btw)

Consider the following multistep reaction: a b→ab(slow) a ab→a2b(fast)−−−−−−−−−−−−−−−−− 2a b→a2b(overall) based on this mechanism, determine the rate law for the overall reaction. express your answer in standard masteringchemistry format. for example, if the rate law is k[a]3[b]2 type k*[a]^3*[b]^2