Дано:
<span>N(S) = 12,10 ∙ 10²³</span>
<span>Найти: m(S)</span>
Решение:
<span>N(S)<span> = </span>N\Na ∙ = 12,10 ∙
10²³ \6,023 ∙ 10²³ моль(-1) ∙ 10
моль = 2 моль</span>
<span>M(S) = 32 г\моль</span>
<span>m(S) = n∙M = 2 моль ∙32
г\моль = 64 г
</span><span>Ответ: m(S) = <span>64 г</span></span>
Дано:
w(Br2O5)
___________
w(O)-?
____________
Mr(Br2O5)=2×80+5+16=239
Mr(O)=16
w(O)=16÷239+100%=0.06%
<span>1) Mg+ O2 = MgO </span>
<span>2) Ca+ O2 = 2CaO </span>
<span>3)Si+O2 = SiO2 </span>
<span>4) 2Н2 + O2 = 2H2O </span>
<span>5)SiH4 + O2 = SiO2 + 2H2</span>