Ответ:
15
Объяснение:
D=молярная масса NO/молярная масса H2
<span> Al2o3 Al2(+3) o3(-2)</span>
<span><span>Li2Se Li2(+1) Se(-2)</span></span>
<span><span><span>Mgbr2 Mg(+2) Br2(-1)</span></span></span>
<span><span><span><span>SF6 S(+6) F6(-1)</span></span></span></span>
<span><span><span><span><span>HRO3 H(+1) R(+5) O3(-2)</span></span></span></span></span>
<span><span><span><span><span><span>H2CO3 H2(+1) C(+4) O3(-2)</span></span></span></span></span></span>
<span><span><span><span><span><span><span>KNO3 K(+1) N(+5) O3(-2)</span></span></span></span></span></span></span>
1. ж) Mg
2. a) Mo
3. д) B
4. и) V
5. в) Na
6. д) B
7. в) Ne
8. и) V
9. и) V, a) Mo
10. ж) Mg, д) B