How do moles relate to atomic mass?

The mass of a mole in grams is equal to atomic mass in amu.
The mass of a mole in amu is 6.02 times the atomic mass in amu.
The mass of a mole in grams is 6.02 times the atomic mass in amu.
The mass of a mole in amu is equal to atomic mass in grams.

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.

Draw the lewis dot structure for each of the following polyatomic ions

In a heat of an engine, if 700 j enters the system, and the piston does 400 j of work what is the final internal (thermal) energy of the system if the initial energy is 1,500 j