Calculate the wave number of the spectral line emitted by an excited hydrogen corresponding to n1 =3 and n2 = 5.​

Which of these is not an example of chemical weathering? a. iron-rich mineral rusting b. feldspar turning into clay c. limestone reacting with acid d. granite breaking up into sand

What is the molar mass of a gas that has density of 2.054 g/l

In the reaction h2co3 (aq) + 3nh3 (aq) = 2 nh4+ (aq) + co3 2-, how many electrons are transferred?