P-32 has a half-life of 14.28 days. 5 grams remain unchanged after 42.84 days. What was the initial amount of P-32?

Sodium sulfate dissolves as follows: na2so4(s) → 2na+(aq) + so42- (aq). how many moles of na2so4 are required to make 1.0 l of solution in which the na concentration is 0.10 m?

Which sample at stp has the same number of atoms as 18 liters of ne at stp

Maya wrote if you step to describe how carbon circulates between the atmosphere and living organisms