Find the frequency of a photon with a wavelength of 20nm

Asample of ammonia reacts with oxygen as shown. 4nh3(g) + 5o2(g) 4no(g) + 6h2o(g) what is the limiting reactant if 4.0 g of nh3 react with 8.0 g of oxygen? o2 because it produces only 0.20 mol of no. nh3 because it produces only 0.20 mol of no. o2 because it produces two times less no than nh3. nh3 because it produces three times more no than o2.

The minerals found in bones are deposited by living cells called

What is the empirical formula of c6h18o3? ch3o c2h5o c2h6o c2h5o5