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Which of these properties, used alone, would be least useful in identifying most minerals? a. color b. luster c. streak d. density

A100-watt light bulb radiates energy at a rate of 100 j/s. (the watt, a unit of power or energy over time, is defined as 1 j/s.) if all of the light emitted has a wavelength of 525 nm , how many photons are emitted per second?

What does x represent in the formula for the compound xcl4?