A sample of 25 L of NH³ gas at 10°C is heated at constant pressure until it fills a volume of 50 L. What is the new temperature in °C?

How many mmols of tris-hcl are there in 100 ml of a 100 mm tris-hcl buffer solution at ph 8.1? note that the 100 mm refers to the sum of tris and tris-hcl concentrations?

How many moles is 14.5 cm^3 of platinum? the density of platinum is 21.45 g/cm^3.

Which of these is a physical property