Problems are listed in approximate order of difficulty. A single dot (•) indicates straightforward problems involving just one main concept and sometimes requiring no more than substitution of numbers in the appropriate formula. Two dots (••) identify problems that are slightly more challenging and usually involve more than one concept. Three dots (•••) indicate problems that are distinctly more challenging, either because they are intrinsically difficult or involve lengthy calculations. Needless to say, these distinctions are hard to draw and are only approximate.
• With what mass of nitrogen would 1 g of hydrogen combine to form ammonia NH3? (Read the hint to Problem 1.)
Problem 1
• With what mass of oxygen would 2 g of hydrogen combine to form water (H2O)? [Hint: All you need to know is the ratio of the masses of the atoms concerned; you can find these masses, listed in atomic mass units, inside the back cover.]
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