Dissolving 3.00 g of an impure sample of calcium carbonate in
hydrochloric acid produced 0.656 L of carbon dioxide at
20.0°C and 792 mmHg.
CaCO3(s) + 2HCl(aq) = CaCl2(aq) + CO2(g) + H2O(1)
Calculate the percent by mass of calcium carbonate in the
original sample

"hydrogen bonding is the attraction of h atoms in the water molecule (slight + charge) to o atoms in a neighboring water molecule (slight - charge); it is a weak interatomic force. but it is still strong enough to the water molecules "stick" together."

it means there are 3 atoms of oxygen

because natural gas is colorless, odorless, and tasteless, distributors add mercaptan (a chemical that smells like sulfur) to give natural gas a distinct unpleasant odor (it smells like rotten eggs). they locate the types of rock that are likely to contain natural gas deposits.