Hey guys! Can anyone help me out? I'm not familiar with the formula (equation) at all! :( CO2 makes up 0.0314% of Earth’s atmosphere. Convert that into parts per million.

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.

Compare and contrast physical changes with chemical changes.

How many grams of oxygen gas are contained in a 15 l sample at 1.02 atm and 28°c? show your work.