一、金属氧化物(如Fe_2O_3等)被H_2(或CO)还原的化学方程式配平技巧是:先在H_2(或CO)前配上与金属氧化物中氧原子个数相同的系数,然后再配其他分子的系数。 例如:Fe_2O_3+3CO高温2Fe+3CO_2↑ 二、碳氢化合物(如CH_4)与氧气燃烧的化学方程式配平技巧是:碳氢化合物中氢的原子个数能被4整除时,碳氢化合物的系数配1,不能被4整除时配2,然后再配其他分子的系数。 First, the metal oxide (such as Fe2O3, etc.) by H2 (or CO) chemical equation trimming skills are: first in H2 (or CO) with the metal oxide oxygen atoms in the same number of coefficients, and then with Coefficients of other molecules. For example: Fe_2O_3+3CO high temperature 2Fe+3CO_2 ↑ Second, the chemical equation for the combustion of hydrocarbons (eg, CH_4) with oxygen is: When the number of hydrogen atoms in a hydrocarbon is divisible by four, the coefficients of hydrocarbons are assigned. 1, can not be divisible by 4 with 2, and then with other molecular coefficients.