The chemical formula of caffeine is C8H10N4O2. Determine the percent composition of nitrogen in the compound. show work

Ammonium perchlorate is a powerful solid rocket fuel, used in the Space Shuttle boosters. It decomposes into nitrogen gas, chlorine gas, oxygen gas and water vapor, releasing a great deal of energy.

Atoms of O-16, O-17, O-18 have the same number of neutrons?

Atoms with loosely held valence electrons have 1. high ionization energy and high electron affinity. 2. high ionization energy and low electron affinity. 3. low ionization energy and high electron affinity. 4.

An element has two naturally-occurring isotopes. The mass numbers of these isotopes are 125 amu and 127 amu, with natural abundances of 45% and 55%, respectively. Calculate its average atomic mass. Report your answer to 1 decimal place

The temperature of gas is 100 K and its volume is 500 ml. If the volume is increased to 1000.0 ml, what is the new temperature of the gas?

When does a spring tide take place? At the beginning of spring Only during the spring season Only after spring is over At any time

The highest cloud are known as

What is the mass of 4.85 X 10^22 atoms of iron (Fe) ?

If element x has 95 protons how many electrons does it have

Which of the following when dissolved in deionized water would make a good conducting solution? a) methanolb) sugarc) baking soda