In beta decay, what is emitted? an electron a helium-4 atom a neutron a photon a radionucleus

Find the number of grams of hcl needed to react completely with .50 moles of magnesium.

How many absorptions would you expect to observe in the 13c nmr spectra of the following molecules? a) 3-chloropentane b) cis-4-methyl-2-pentene

Answer asap : ( a. how does mucus prevent the entry of pathogens? b. describe two ways white blood cells protect us from pathogens.