Help it's important please

Look at the reaction below: ca(hco3)2 --> caco3 + co2 + h2o first, balance the reaction. once balanced, use dimensional analysis or another method to find out how many moles of carbon dioxide will be produced if we start with 16.5 moles of calcium bicarbonate (calcium hydrogen carbonate). = mol of co2 number needs to be reported to three significant figures.

Embryos of different species look very similar, which shows that the organisms share a ancestor.

Use the periodic table to determine the electron configuration of dysprosium (dy) and americium (am) in noble-gas notation.