Xis an oxide of nitrogen

2.30g of x contains 3.01 x 10 22 molecules of x calculate the molar mass of x

M 6,022*10^22 molecules
2,30g 3,01*10^22 molecules

or 1 mole has 6,022*10^22 molecules so (2,30/Molar mass) = nr of moles with 3,01*10^22 molecules
which will lead to the same thing.
M= 4,6

According to arrhenius theory of acid and bases, an acid is a proton donor, while base donates hydroxyl ions. further, acid and base reacts to form salt and water.consider following example.hcl    +      h2o          →      cl-          +      h3o+here, hcl has donated a proton, hence it is an acid.now consider following reactionhcl      +      naoh            ↔      nacl      +        h2oin this reaction, hcl donates proton, hence it is acid. on other hand, naoh donates hydroxyl ion (i.e. hence it is a base.   

Jean-baptiste lamarck