formula substance what is the formula for this substance?( Heme)

formula substance what is the formula for this substance?( Heme) The mass of 0.02mol of a substance is 0.88g1.what is the molar mass of this substance?2.what is its chemical formula? A highly volatile substance initially has a mass of 1200g and its mass is reduced by 12% each second.Q1.Write a formula that gives the mass of the substance(m) at time(t) seconds.Q2.Rearrange this formula to make t the subject.Q3.What mass remains af formula是什么意思 especially formula especially formula especially formula formula 30 乙醇规格：Formula 30 foreign substance是什么意思 Substance dependence什么意思 commercial substance是什么意思 economic substance是什么意思 adaptable substance什么意思? land substance什么意思 commercial substance是什么意思 dependence,substance是什么意思 翻译词组：substance abuse what is a subscript in a chemical formula?what's the relationship between element and stom?我科学作业做不出~~~Science!还有几个问题：How to tell a substance is a compound or not a compound?How does the density make things sink of float