How many grams of Aluminum are needed to produce 45.3 grams of Iron metal?

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?

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How do dying stars contribute to the formation of planets