How many moles are in 20 grams of sodium

When ethane (C2H6) burns, it produces carbon dioxide and water: 2C2H6 (g) + 7O2 (g) →4CO2 (g) + 6H2O (l) How many liters of carbon dioxide will be produced when 89.5 L of ethane are burned? (One mole of any gas occupies 22.

Explain how Beer's law can be applied in food, drug or medical testing

Explain how Niels Bohr's observation of hydrogen's flame test and line spectrum led to his model of the atoms containing electron orbits around the nucleus?

The mass of an elephant on the moon would be: a: less than its mass on mars b: more than it's mass non mars c: the same as it's weight on the moon d: none of the above

Which of the following best describes an atom? (1) protons and electrons grouped together in a random pattern (2) protons and electrons grouped together in an alternating pattern (3) a core of protons and neutrons surrounded by electrons (4) a core

The subatomic particle that has the least mass is the ...

Which two properties are used to define matter? has mass and conducts heat has buoyancy and volume has mass and takes up space conducts energy and has characteristic properties

Calculate the energy if 48.7 g of Al reacts in the following reaction. (Al = 26.98 g/mol) Fe2O3 (s) + 2 Al (s) →Al2O3 (s) + 2Fe (s) ∆Hrxn = - 852 kJ.

Which type of wave has a wave perpendicular to the disturbance? Surface Longitudinal Mechanical Tranverse

Caffeine's molecular formula is c8h10n4o2. the molar mass of caffeine is 194g/mol. what is the percentage of carbon in caffeine