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Calculeaza numarul de atomi de oxigen din: a)196 grame acid sulfuric. b)252 grame acid azotic

Răspuns :

n=m÷M
a)m=196 g H2SO4
M= 2AH+AS+4AO
M= 2+32+64= 98
n=196÷98
n= 2 mol
nr.atomi=2×6.023×10la puterea 23

b)m=256g HNO3
M= AH+AN+3AO
M= 1+14+48=63
n=256:63= 4.06
nr.atomi=4.06×6.023×10la puterea 23