If a substance has a half life of 5 years , then how much of the initial sample remains after 15 years

Aluminum reacts with chlorine gas to form aluminum chloride via the following reaction: 2al(s)+3cl2(g)→2alcl3(s) what is the maximum mass of aluminum chloride that can be formed when reacting 32.0 g of aluminum with 37.0 g of chlorine? express your answer to three significant figures and include the appropriate units.

Write the complete balanced equation for the reaction between lead (iv) oxide (pbo2) and water (h2o).

State the formula for density in words and mathematical symbols