could someone explain to me moles, molar mass the atomic number of an element and what they have to do with?

Question

each other??? i don't understand what the difference is between a mole and molar mass. how do i find how many atoms are in 2.50 moles of Hydrogen? i really appreciate the help!

i've read my book a million times..i've called every friend i know but i am still way confused. please help me.

Answer 1

well they all relate to each other, you have 2 formulas
n = m/M where n is the number of moles, m is the mass of the compound and M is the molar mass of the compound.
molar mass can be found by looking on the periodic table and adding up the molecular weight. so for hydrogen, since in its normal state, hydrogen exist as H_2, when you look on the periodic table, there should be a value of 1.00794 which is the molecular weight. since there are 2 hydrogens, 2x1.00794 = 2.01588mol/g (M)
in 1 mol of hydrogen there are 2.01588grams of Hydrogen.
now for you question about atoms,
n = # of atoms / avagadros number
2.5moles = # of atoms/ 6.022x 10^23
2.5moles x 6.022x10^23 = n# of atoms
1.5055x10^24 atoms.

Answer 2

Most of the Universe consists of matter and energy. Energy is the capacity to do work. Matter has mass and occupies space. All matter is composed of basic elements that cannot be broken down to substances with different chemical or physical properties. Elements are substances consisting of one type of atom, for example Carbon atoms make up diamond, and also graphite. Pure (24K) gold is composed of only one type of atom, gold atoms. Atoms are the smallest particle into which an element can be divided. The ancient Greek philosophers developed the concept of the atom, although they considered it the fundamental particle that could not be broken down. Since the work of Enrico Fermi and his colleagues, we now know that the atom is divisible, often releasing tremendous energies as in nuclear explosions or (in a controlled fashion in) thermonuclear power plants.

Subatomic particles were discovered during the 1800s. For our purposes we will concentrate only on three of them, summarized in Table 1. The proton is located in the center (or nucleus) of an atom, each atom has at least one proton. Protons have a charge of +1, and a mass of approximately 1 atomic mass unit (amu). Elements differ from each other in the number of protons they have, e.g. Hydrogen has 1 proton; Helium has 2.

The neutron also is located in the atomic nucleus (except in Hydrogen). The neutron has no charge, and a mass of slightly over 1 amu. Some scientists propose the neutron is made up of a proton and electron-like particle.

The electron is a very small particle located outside the nucleus. Because they move at speeds near the speed of light the precise location of electrons is hard to pin down. Electrons occupy orbitals, or areas where they have a high statistical probability of occurring. The charge on an electron is -1. Its mass is negligible (approximately 1800 electrons are needed to equal the mass of one proton).

Table 1. Subatomic particles of use in biology.

Name Charge Location Mass
Proton
+1
atomic nucleus
1.6726 X 10-27 kg

Neutron
0
atomic nucleus
1.6750 X 10-27 kg

Electron
-1
electron orbital
9.1095 X 10-31 kg

Answer 3

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Answer 4

Molar mass is just basically the relative atomic mass of an element or compound, mol: I'm not exactly sure what it is... from what I know, mol is just the unit that is used to work with, (number of moles), and the atomic number is the number of protons, i believe.

Answer 5

I took high school chemistry in 1974 and.....even in those ancient times we had a text book issued to supplement the class work. Get yours out and read it.