How many neutrons does element X have if its atomic number is 21 and its mass number is 95?

A patient receives 3.3 L of glucose solution intravenously (IV). If 100. mL of the solution (carbohydrate), how many kilocalories did the patient obtain from the glucose solution?

What are groups of two or more atoms bonded together that function as a single unit?

If you burn 6 moles of Hydrogen gas how much heat is generated? 2H2 + O2 → 2H20+286 kJ

A block of metal has a width of 3.2 cm, a length of 17.1 cm, and height of 4.2 cm. Its mass is 1.1 kg. Calculate the density of the metal.

All hypotheses are valuable, even if they turn out not to be true. Which answer does not support this statement? A) an incorrect hypothesis means the experiment failed.

Which elements can be found in the sun? a. hydrogen and oxygen b. helium and oxygen c. hydrogen and helium d. hydrogen and nitrogen?

A sample of hydrogen gas at 2.0 atmospheres and 273 k occupies a volume of 5.0 liters. the gas sample is completely transferred to a 10.0-liter sealed, rigid container.

To make sure that the white powder was all sodium chloride and not mixed with sodium hydrogen carbonate, would you need to add a little less or a little more hydrochloric acid to the reaction?

A 10.0 gram sample of h2o at 23.0c absorbs 209 joules of heat. what is the final temperature

What does the sum of the protons and neutrons in an atom equal