Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g)

If Magnesium is a solid, how can you determine the rate of reaction?

Flourine is found to undergo 10% radioactivity decay in 366 minutes determine its halflife

Iwould appreciate if someone could me.

To prevent the presence of air, noble gases are placed over highly reactive chemicals to act as inert "blanketing" gases. a chemical engineer places a mixture of noble gases consisting of 4.37 g of he, 13.36 g of ne, and 36.65 g of kr in a piston-cylinder assembly at stp. calculate the partial pressure in torr of kr.