generate questions: The chemical composition of wood varies from species to species, but is approximately 50% carbon, 42% oxygen, 6% hydrogen, 1% nitrogen, and 1% other elements (mainly calcium, potassium, sodium, magnesium, iron, and manganese) by weight. Wood also contains sulfur, chlorine, silicon, phosphorus, and other elements in small quantity.
What approximate percentage of carbon does wood have? {sep_token} What element makes up about 6% of the chemical composition of wood? {sep_token} About what percentage of wood is composed of nitrogen? {sep_token} Which element in wood composes about 42% of its weight? {sep_token} What element joins potassium, calcium, manganese, iron, and sodium to make a combined 1% of the chemical composition of wood?