Sodium-24 has a half life of 15hrs. How many hours is 3 half lives?

What is the formula for the molecular compound nitrogen monoxide

What is the ph of a solution that has a hydrogen ion concentration of 1.0 * 10 -9 m?

Acm ruler with main graduations from 1 to 10 from left to right there are 10 secondary graduations between each of the main graduations there is a line that begins. at the left end of the ruler 10 secondary graduations to the left of the “1 main graduation the right end of the line ends on the eighth secondary graduation to the right of 3 how long is the line