How does we know that a substance is legal through chromatogrom of chromatography

In 1901, thomas edison invented the nickel-iron battery. the following reaction takes place in the battery. fe(s) + 2 nio(oh)(s) + 2 h2o(l) fe(oh)2(s) + 2 ni(oh)2(aq) how many mole of fe(oh)2, is produced when 5.35 mol fe and 7.65 mol nio(oh) react?

Define a is a tiny pavket of energy

What substance has a mass of 9.5g and volume of 2.1cm^3