1. An isotope of Luckycharmium has a half-life of 120 days. How many days will have passed when 50% of a Luckycharmium sample remains?

An object displaces 652 ml of water. the volume of the object is: 0.652 cm³ 6.52 cm³ 65.2 cm³ 652 cm³

What volume of a 0.0606 m solution of strontium bromide is needed to obtain 0.340 mol of the compound? question 42 options: a)5.61 l b) 3.4 l c) 600 ml d) 1 l e) 178 ml

How many atoms or molecules are there in a mole of a substance?