What is number is moles in 15 grams of nitrogen

Consider a culture medium on which only gram-positive organisms such as staphylococcus aureus colonies can grow due to an elevated nacl level. a yellow halo surrounds the growth, indicating the bacterium fermented a sugar in the medium, decreasing the ph as a result and changing the color of a ph indicator chemical. this type of medium would be referred to as a differential and enrichment culture.

What percentage of energy used in the u.s is produced from fossil fuels

Помогите решить 5 номер в структурном виде пожалуйста буква д пожалуйста подробно мне понять надо