Fill in the blank with the correct number to balance the equation: 4Cr + 3O2 → ___Cr2O3

What is the number of moles in 15.0 g ash3?

Astring vibrates with a frequency of 10 hz. why can't a person hear the sound waves produced by the vibrating string, no matter how large the amplitude of the waves? out! this is homework and due tomorrow! you so much!

Of the following elements, which is the least reactive? a. c b. h c. li d. he