Question

calculați compoziția procentuala pentru substanta Na2SO4​

Answer 1

Răspuns: 32,93% Na; 22,53%S; 45,07%O

Explicație pas cu pas: $M_{Na_{2}SO_{4}}=2A_{Na}+A_{S}+4A_{O}=2\cdot23+32+4\cdot16=142~\frac{g}{mol}$

$142g~Na_{2}SO_{4}...23\cdot2g~Na...32g~S...4\cdot16g~O\\\\100g~Na_{2}SO_{4}...~~~~x\%Na...~y\%S~...~~~~z\%O~~$

$x=\frac{100g\cdot2\cdot23g}{142g} \approx 32,93\%Na$

$y=\frac{100g\cdot32g}{142g} \approx 22,53\%S$

$z=\frac{100g\cdot4\cdot16g}{142g} \approx 45,07\%O$