The mass of an evacuated 255-mL flask is 143.187 g. The mass of the flask filled with 264 torr of an unknown gas at 25 ∘C is 143.289 g . Calculate the molar mass of the unknown gas.

Achemistry student weighs out of phosphoric acid , a triprotic acid, into a volumetric flask and dilutes to the mark with distilled water. he plans to titrate the acid with solution. calculate the volume of solution the student will need to add to reach the final equivalence point. round your answer to significant digits.

What does the xylem do? stores the glucose captures the sunlight absorbs oxygen into the leaf carries water from the roots to the leaves

Select the word from the list that best fits the definition the nuclear family into which a person is born or adopted.