What is the molar mass of the solid?

I need help with molar mass can you help? I don't know what to do with the coefficients? ,ajsdhfblieaufbalieru?

• So I know when you are finding molar mass you use the little numbers at the bottom (haha I can't remember what to call them) For example if you had H2O then you would take the atomic mass of Hydrogen (1.008) and multiply it by two and then you would add that to the atomic mass of Oxygen (16.0) and you would end up with 18.016. But If you had something like 2H2O (Sorry I don't even know if thats a real thing I'm just making a quick example) would you multiply the 2.016 that you get from H2 by two again?

• Answer:

  They're called subscripts, and yes, you could do it that way, or you could take the entire molar mass of water and multiply it by two. Either way, you're adding up four hydrogen molecules and two oxygen. It's a property of multiplication.