A strip of magnesium is placed into a test tube with hydrochloric acid to form magnesium chloride and hydrogen. The mass of the reactants is measure to be 12g. After the reaction is complete, the mass of the system is 11.8g. Knowing the Law of the Conservation of Mass, what happened to the rest of the mass?

Significant figures are digits read directly from the measuring instrument plus one more digit, which is __ by the observer.

Ascientist measures the speed of sound in a monatomic gas to be 449 m/s at 20∘c. what is the molar mass of this gas?

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