M, toluen= 92g/mol
M,HNO3=63g/mol
c=mdx100/ms=>md=cxms/100=31x200/100g=62gHNO3
1mol...................3mol SAU in grame
C6H5-CH3 + 3HONO2---> C6H2(NO2)3-CH3+3H2O
92g......................3x62g
x..................................63g
x=m,HNO3=.........................CALCULEAZA !!!!!