- Math problems about equivalence relations,etc?

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How many liters of hydrogen will you make (at STP) if you react 3.51 L of 0.97 M hydrochloric acid with excess zinc? Specific Heat Capacity depend on what factors ? What is the magnitude of a point charge whose electric field 32 cm away has the magnitude 2.5 N/C? If I know the standard deviation, mean and individual score, how many standard deviations is the individual score from the mean? 3pm GMT time to arizona standard mountain time?