What is the percent by mass of calcium in calcium carbonate, CaCO3?
(Molar mass of CaCO3 = 100.09 g/mol)

%

What does the cell nucleus do or, how does it function?

The covalent compound acetylene, which is the fuel of the oxyacetylene torch used by welders, has the molecular formula c2h2. the covalent compound benzene, a commercial solvent, has the molecular formula c6h6 each of these covalent compounds contains carbon and hydrogen atoms in a one-to-one ratio. would it be correct to write the chemical formulas of each as ch? explain.

List the path of the respiratory system