How many atoms are in 2.5 moles of beryllium atoms?

Find the volume occupied by 4.00 g of helium gas at 25.0o C and 1.18 atm of pressure.

A chloride of this element is 67.2% chlorine by mass. In a 100 g sample how many moles of chlorine are there? (This info will be used to determine the empirical formula.

Given that Kw for water is 2.4*10-14 M2 at 37 °C, calculate the pH of a neutral aqueous solution at 37 °C, which is the normal human body temperature. pH = Is a pH=7.00 solution acidic, basic, or neutral at 37 °C? neutral basic acidic

What is the mole ratio of pbo2 to water?

If an international student returns to her country of origin and works for an MNE whose headquarters is in the country where she studied, then she is a Answers: A. PCN B. HCN C. TCN D. not enough information

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