calculate the product of 0.002 115 m and 0.000 040 5m. Express the answer in scientific notation and with the correct number if significant figures

Calcium hydride (cah2) reacts with water to form hydrogen gas: cah2(s) + 2h2o(l) → ca(oh)2(aq) + 2h2(g) how many grams of cah2 are needed to generate 45.0 l of h2 gas at a pressure of 0.995 atm and a temperature of 32 °c?

How many neutrons does a atom of cobalt have?

How many moles are contained in 5.6 l of h2 at stp