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

Ascientist measures the speed of sound in a monatomic gas to be 449 m/s at 20∘c. what is the molar mass of this gas?

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

Which type of intermolecular force is pbr3