Question

hi i have doubt in example 38 plz ans it in a paper with steps and calculations also do not apply unitary method I need according to formula plz help me also i need steps for calculation part and final ans has to be rounded off or not as in my book they did not round off they wrtie exact ans can we round off?? Final ans i meant​

Answer 1

Answer:

one mole of water contains avogadro no. of molecules

so to find mass of one water molecule,

you have to divide the mass of one mole by avogadro no.

molar mass=18

one molecule mass=18/6.023*10^23

m=10^-23 *2.09

but if you round off you will get 3*10^-23

i think you should go according to the book

depends on the kind of answer

even if you round it off it doesnt matter