Moles, Atoms, Molar Mass & Conversion of Meters, Liters, etc, Help!?

Question

My first question is figure out moles and atoms. Just give me the basic information about how to figure out questions that pertain to moles, atoms, and molar mass.
My second question is can you give me a list on how to go grom cm to meter to km, etc and ml to liters, etc

Answer 1

A mole is a way of simplifying a big number into a small number. There are 6.022 x10^23 of something in a mole...so, one mole of sodium is 6.022x10^23 atoms. Does that make sense?

Molar mass is the mass of a mole of something. So, the molar mass of sodium is how much 1 mole of sodium weights. That's the number that you see underneath an atom's symbol on the periodic table, in grams. So, a mole of carbon weighs 12.011 grams, or whatever the actual number is.

To convert metric measurements, think of the PREFIX on the measurement.

milli-whatever means 1/1000 of the whatever. A milliliter is 1/1000 of a liter.
Centi- means 1/100
Deci- (which you almost never see) is 1/10 of that something.
Kilo means 1000 of that something. A kilometer is 1000 meters.
Mega means 1,000,000, so a megameter is 1 million meters. You usually just see this as "1,000 kilometers", which is the same thing, because 1,000 meters are in a kilometer, and 1,000 kilometers are in a megameter.

Read the site below for some more in-depth help with the metric system.

Answer 2

and molar mass pertains to the number of grams in a substance in order to make one mole of atoms. For example, carbon has a molar mass of 12.011. This means that it would take 12.011 grams of carbon in order to make one mole of carbon or 6.022E23 atoms. If the substance is made of more than one element, than to find its total molar mass, we add all the molar masses of the substance together. e.g. H2O=2*(1)+16=18.
Metric conversions:
to change units, we simply have to know how many of one unit will fit inside of whatever unit we want those units to become. for example, there are 100 cm in a meter and there are 1000 m in a km. to convert between them, we take the units that we already know and we multiply by a fraction that contains the new units that we want in the numerator and the old units in the denominator. For example, to find the number of meter there are in 10 cm, we would do this:
10 cm * (1 m)/(100 cm) = .1 m
notice that the fraction 1m/100cm contains two equal expressions in the numerator and denominator, this means that we are really just multiplying 10 cm by 1 and just readjusting how we communicate the distance. Remember to put the old units on the bottom of the fraction, otherwise the units will not cancel and the method will not work.

Answer 3

Every element has an atomic weight, and every molecule has a molecular weight which is the sum of the atomic weights of all the atoms in it. A mole is defined as being the number of grams of a substance which is numerically equal to the atomic or molecular weight. If you think about this, you will see that the number of atoms or molecules in a mole is a constant. This constant is called Avogadro's number, and its numerical value is 6.023 x 10^23. Thus, there are that many water molecules in 18 grams (one mole) of water.
Your second question illustrates one of the nice features of the metric system. There are a series of prefixes, each of defined value; their names and the decimal exponents of their values are: femto (-15), pico (-12), nano (-9), micro (-6), milli (-3), centi (-2), deci (-1), deca (+1), hecto (+2), kilo (+3), mega (+6), giga (+9), and tera (+12). (There are a few others which I'll skip.)Thus, one microliter is 10^-6 liter, and one kilogram is 10^+3 grams.

Answer 4

there are 6.022X10^23 atoms/molecules in a mole. Remember this number it will be very important. As for you second question you just need to learn what they stand for. They are all based on 10. Usually the units are 1000 units a apart. Like 1 gram=1000milligram or 1000 grams= 1 kilagram

Answer 5

Atoms are the smallest parts of an element. They consist of protons, electrons, and neutrons. The protons and neutrons have all the mass, the electrons are nearly weightless.

The atomic number of an element, is the sum of the number of protons and neutrons. Variations in that number are called "isotopes."

A "mole" is the smallest part of a "compound" that can exist. A "compound" is a mixture of two, or more elements. Look for Avagadro's number. That's the mathematical key.

Hey, a "centi" means one-hundreth. Be that a litre, meter, or whatever. Look to the Latin terms: nanno, milli, centi, and so on. You'll learn alot.

I hope that I've helped.

Answer 6

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