Considerando as equações abaixo: 5
C2H2(g) +5026) 2 CO2(g) + H2050 AH = – 1.299,5 kJ
Cigr) + O2(g) + CO2(g) AH = – 393,5 kJ
1
H2(g) + 2 02(0) H20) AH 5 – 285,8 k]
Calcule a variação de entalpia da reação:
2 C(gr) + H2(g) → C2H2(g)
O (A) +226,7 kJ
O (B) +620,2 kJ
O(C) +798,3 ku
(D) -1.978,8 kJ
(E)-2.372,3 kJ

Astudent made the lewis dot diagram of a compound shown. what is the error in the lewis dot diagram? a)an o atom should transfer all of its six electrons to mg because the formula is mgo b) both electrons of mg should be transferred to one o adam because the formula is mgo c) the electrons should be transferred from each o add him to capital mg because mg has fewer electrons d) the number of dots around mg should be four because it has to transfer two electrons to each o

Asample of ammonia reacts with oxygen as shown. 4nh3(g) + 5o2(g) 4no(g) + 6h2o(g) what is the limiting reactant if 4.0 g of nh3 react with 8.0 g of oxygen? o2 because it produces only 0.20 mol of no. nh3 because it produces only 0.20 mol of no. o2 because it produces two times less no than nh3. nh3 because it produces three times more no than o2.

Which of the following units is not an official si unit? mole liter kilogram ampere