Izma N. answered 05/04/21
Devoted to Help Students Climb Bloom's Taxonomy pyramid
In given equation, 2 moles of NaClO3 produces 2 moles of NaCl, the ratio here is 2:2 but as required that if 7 moles of NaClO3 react so how many moles of NaCl is produced so same 7:7 that is 7 will be produced.
this can also be solved by another method
2 moles of NaClO3 = 2 moles of NaCl
7 moles of NaClO3 = x moles of NaCl
cross multiply both
2 into x = 7 into 2