Find the expression that can be used to designate 3 moles of atoms.
Which of the following is an example of double displacement reaction? (i) CO2(g)+H2(g)→CO(g)+H2O(g) (ii) P4O10(s)+6H2O(l)→4H3PO4(aq) (iii) H2+O2→H2O (iv) CoCl2(aq)+Na2CO3(aq)→CoCO3(aq)+2NaCl(aq)