Cr2O3+6NaOH=2Сr(OH)3+3Na2O
Если не ошибаюсь, 2,4-диметил-5-этил-1,3-гептадиен
(NH4)2SO4 - сульфат аммония.
М((NH4)2SO4) = 2*Ar(N) + 4*2*Ar(H) + Ar(S) + 4*Ar(O) = 2*14 + 8*1 + 32 + 4*16 = 132 г/моль.
<span><span>4 Li</span> + <span>O2</span> → <span>2 <span>Li2O
</span></span></span><span><span>2 Na</span> + S → <span>Na2S
</span></span><span><span>2 K</span> + <span>Cl2</span> → <span>2 <span>KCl
</span></span></span><span>Al + C → <span>AlC
</span></span><span><span>3 <span>Ca</span></span> + <span>2 <span>P</span></span> → <span>Ca3P2</span></span>