Chemistry HELP get 10 points?

Question

15) a. What is the molar mass of an element?
b. To two decimal places, write the molar masses of carbon, neon, iron, and uranium.

Answer 1

Solutions:

1. In sodium fluoride, there is one atom of sodium and one atom of fluorine. The molar mass will then be:
(1 atom x 23 grams/mole of sodium) + (1 atom x 19 grams/mole of fluorine) = 42 grams/mole of sodium fluoride

2. In potassium hydroxide, there is one atom of potassium, one atom of hydrogen, and one atom of oxygen. The molar mass will then be (1 x 39 grams) + (1 x 1 gram) + (1 x 16 grams) = 56 grams/mole of potassium hydroxide

3. In copper (I) chloride, there is one atom of copper and one atom of chlorine. The molar mass is then (1 x 63.5 grams) + (1 x 35.5 grams) = 99 grams/mole of copper (I) chloride

4. In manganese (IV) oxide, there is one atom of manganese and two atoms of oxygen. The molar mass is then (1 x 55 grams) + (2 x 16 grams) = 87 grams/mole of manganese (IV) oxide

5. In calcium sulfate, there is one atom of calcium, one atom of sulfur, and four atoms of oxygen. The molar mass is then (1 x 40 grams) + (1 x 32 grams) + (4 x 16 grams) = 136 grams/mole of calcium sulfate

6. In magnesium phosphate, there are three atoms of magnesium, two atoms of phosphorus, and eight atoms of oxygen. (The formula is Mg3(PO4)2). The molar mass is then (3 x 24 grams) + (2 x 31 grams) + (8 x 16 grams) = 262 grams/mole of magnesium phosphate

Answer 2

The molar mass of an element is a quantity of it, in grams, equal to its atomic weight. The atomic weight of carbon is 12 (by definition!), so the molar mass of carbon is 12 grams. Check your handy periodic table for the others.

Answer 3

Molar mass
From Wikipedia, the free encyclopedia
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Molar mass is the mass of one mole of a chemical element or chemical compound.

A mole is defined as Avogadro's number of particles of any kind of substance (atoms, ions, molecules, or formula units).

In chemistry, the unit is g/mol, although the International System unit is kg/mol. The atomic mass listed for the elements on the periodic table can be interpreted in two ways: first as the mass of a single average atom of the element in unified atomic mass units (u), or secondly as the mass of one mole of the element in grams. This second use is the molar mass of the element and is most useful in stoichiometric calculations. In physics, molar mass is usually defined in kilograms per kilomole (kg/kmol). Molar mass is different from Molecular mass which is the mass of one molecule.

In linear polymers not every polymer chain consists of the same amount of repeating units. A given polymer sample is said to be made up of a mixture of macromolecules with a certain molar mass distribution.

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Example
Let us see how many grams are in one mole of table sugar with a chemical formula of . The molecular mass is

daltons.

1 mole of the sugar = grams. As one sees, the molecular mass and molar mass are equal except that their units are daltons and grams, respectively.
Note: A dalton is also known as an atomic mass unit (AMU).

http://en.wikipedia.org/wiki/Molar_mass

Answer 4

molar mass of an element is mass of that element in one mole of that element.

12.01 Carbon
20.18 Neon
55.85 Iron
238.03 Uranium

Answer 5

Here, since the last person's definition was REALLY long, I'll simplify it for you:
The molar mass of an element is the mass of one MOLE of the element. To find the mass of one MOLE of an element, you look at the periodic table:
http://en.wikipedia.org/wiki/Periodic_table#Methods_for_displaying_the_periodic_table
Find the element, click on it and then see what it says the mole mass is. (atomic mass)

B)
Carbon:
Atomic mass 12.01 g/mol

Neon:
Atomic mass 20.18 g/mol

Iron:
Atomic mass 55.85 g/mol

Uranium:
Atomic mass 238.03 g/mol

Answer 6

The molar mass of an object is the same as its atomic mass so:
Carbon - 12.01
Neon - 20.18
Iron - 55.85
Uranium - 238.03

Answer 7

Molar mass of "C" is 12.0108 g/mol
Molar mass of "Ne" is 20.1798 g/mol
Molar mass of "Fe" is 55.8452 g/mol
Molar mass of "U" is 238.0289 g/mol