A neutral atom has 12 protons and 13 neutrons in its nucleus. What is its mass number?

Achemistry student weighs out 0.306 g of citric acid (h3c6h5o7), a triprotic acid, into a 250 ml volumetric flask and dilutes to the mark with distilled water. he plans to titrate the acid with 0.1000 m naoh solution. calculate the volume of naoh solution the student will need to add to reach the final equivalence point. be sure your answer has the correct number of significant digits.

The element that has the greatest electronegativity is

Suppose you wanted to make 100 grams of water. what is the molar mass of water (h2o)?