How much water, in grams can be made from 6.2x10^24 hydrogen molecules? Answer in units of grams

How do you know when a chemical reaction has occurred

Use the periodic table to find the molar mass of each element. molar mass h = g/mol molar mass s = g/mol molar mass o = g/mol

Rank the four gases (air, exhaled air, gas produced from from decomposition of h2o2, gas from decomposition of nahco3) in order of increasing concentration of co2