The atomic mass of element A is 63.6amu. Theo only naturally occurring isotopes of element A are A-63 and A-65. The percent abundances of element A are closest to? a) 31% A-63 and 69% A-65
b) 50% A-63 and 50% A-65
c) 100% A-63 and 0% A-65
d) 69% A-63 and 31% A-65

a gas, having a molecular weight of 13 kg/kmol and a kinematic viscosity of 0.25 cm2/s, flows through a pipe 0.25 m internal diameter and 5 km long at the rate of 0.4 m3/s and is delivered at atmospheric pressure.

warm front forms when a moist, warm air mass slides up and over a cold air mass. as the warm air mass rises, it condenses into a broad area of clouds. a warm front brings gentle rain or light snow, followed by warmer, milder weather.

hope i !

the correct answer would be b. amelia, because the particals of gas move really fast (charged particals) and gas also has a lot of room (particals move independently) so the only answer that has both of those is amelia's.