2000g20的精选

问题详情：配制2000g20%的稀硫*用以除锈，需98%的浓硫*和水各多少毫升？【回答】解：设需浓硫*的质量为x2000g×20%=x×98%x=408.2g浓硫*体积=408.2g÷1.84g/cm3=221.8mL水的体积=(2000g-408.2g)÷1g/cm3=1591.8mL知识点：*和碱...