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The number of known elements changed very rapidly over a
150-year period. There were 62 known elements in the mid-1800s.
How many know elements (total) are there today?

How many grams of co(g) are there in 74.5 ml of the gas at 0.933 atm and 30o c?

Suppose that some of the compound spilled out of the crucible after it was heated. would that cause the percent by mass of water in the compound determined by the experiment to be too low, too high, or unchanged? briefly explain your answer.

Substance a is a nonpolar liquid and has only dispersion forces among its constituent particles. substance b is also a nonpolar liquid and has about the same magnitude of dispersion forces among its constituent particles. when substance a and b are combined, they spontaneously mix.