Is this chemical equation balanced? yes or no

Mg + 2O ---> 2MgO

Llama have 74 chromosomes how many chromosomes will they be found in their gametes explain how you know

Sulfuric acid (a component of acid rain) reacts with limestone (calcium carbonate) to produce calcium sulfate and carbon dioxide. this damages buildings and statues made of limestone. which solution of sulfuric acid will damage these structures more quickly? a. 0.001% b. 0.005% c. 0.010% d. 0.015%

How many moles of air are there in a human lung with a volume of 2.4 l at stp? explain your answer