.7 g= .17 mol = 1.05 x 10^23 atoms
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To find the number of atoms in 0.7 grams of Helium, you need to first determine the number of moles using the Atomic Mass of Helium (4 g/mol). Next, use Avogadro's number (6.022 x 10^23) to convert moles to atoms. This will give you the number of atoms in 0.7 grams of Helium.
1 gram Helium ( 1 mole He/4.003 grams)(6.022 X 10^23/1 mole He)
1.5 X 10^23 atoms of helium
2 grams helium (1 mole He/4.003 grams)(6.022 X 1023/1 mole He)
= 3 X 1023 atoms of helium
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4 g of helium has 6.023 x 1023 atoms.
So, 0.0247 g of heium will have 0.0247 x 6.023 x 1023 / 4 atoms or 3.72 x 1021 atoms
The relative molecular mass of helium is approximately 4.0, therefore 4.4 grams contains 1.1 moles.
By definition, one mole would be the same as the atomic mass. You take the number of moles and multiply it by the atomic mass. So if you have just 1 mole, the number of grams will be the atomic mass. Calcium's atomic mass is 40.08 grams.
Remember K H D | d c m (kilo, hecto, deka, (liter, meter, gram), deci, centi, milli). These are the denominations you need to list when converting metric units. Kilograms are three places to the left of grams. So you have to move the decimal place three times to the left (same as dividing by 1000). You will get 70 g = .07 kg.
1 km = 1000 metres = 100,000 centimetres so 07 km = 700,000 cm. Simple.
Summer Snow was created on 2000-07-07.
0.07 kilometers is 70 meters. (km x 1,000 = meters)