Bonus question #2: Unknown element, Element X, exists in nature as two isotopes: ^{351}
351

X has a mass of 350.9196 u and
^{353}
353

X has a mass of 352.9209 u. The average atomic mass of Element X is 351.96 u. Calculate the relative abundance of the two Element X isotopes.

Consider the reaction: n2(g) + o2(g) ? 2no(g) kc = 0.10 at 2000oc starting with initial concentrations of 0.040 mol/l of n2 and 0.040 mol/l of o2, calculate the equilibrium concentration of no in mol/l how would this be done?

May someone me with these science questions

Liquid from a brewery fermentation contains 10% ethanol and 90% water. part of the fermentation product (50,000 kg/h) is pumped to a distillation column on the factory site. under current operating conditions, a distillate of 45% ethanol and 55% water is produced from the top of the column at a rate of one-tenth that of the feed. what is the composition of the waste "bottoms" from the still?