Suppose a new element with an average atomic mass of 22.892 u is discovered on Mars. This element is composed of two isotopes. The most abundant isotope has a natural abundance of 80.756% and an isotopic mass of 23.208 u. Calculate the isotopic mass of the least abundant isotope.

Sandy is building a small toy car. he wants to use a balloon to power the toy car. he fills a balloon with air and then attaches a straw to the balloon. he tapes the balloon-straw combination to the car and then releases the end of the balloon. the toy moves forward as the air from the balloon comes out the back of the straw. what can sandy do to make the toy car move faster? a) use less air in the balloon. b) blow up the balloon more. c) use a longer straw. d) use larger tires.