If grams/molar mass=moles, then first the molar mass of the compound must be found. CaCl2 has a molar mass of 110.984. Divide the number of grams, 15.5, by 110.984, and you get the number of moles. Now, seeing as calcium is not diatomic like oxygen or chlorine, there needs to be no conversion between the number of moles of calcium in the compound and the number of moles of calcium outside of the compound. atoms, the number of calcium atoms in the compound divided by one mole of the compound will give us the ratio. Conveniently enough, that ratio is one calcium atom per molecule of calcium chloride, meaning that for every one mole of calcium chloride, 1 mole of pure calcium can be extracted. So once you find the number of mole of CaCl2, that is the number of moles of calcium as well. This may be a little difficult to grasp, but I'm sure that your teacher, if you're a student, will be able to explain why rather well.
1 km 155 m how many meters is that???
There are 0.000155 kilowatts (kW) in 155 milliwatts (mW).
[155 (g Ag2O) / 231.8 (g Ag2O/mol Ag2O)] * 2 (mol Ag/mol Ag2O) == 310/231.8 mol Ag = 1.337 == 1.34 mole Ag
Divide by 0.0254
15.5cm
2.27
Well, Ca has an atomic mass of 40, so one mole of Ca (6.022x1023 atoms) equals 40g.To get 5kg of Ca, you would times the 40g (one mole) by 125.5kg of Ca has 125x(6.022x1023), or602200000000000000000000 atoms.
93,341,000,000,000,000,000,000,000 or 933.41 x 1023 atoms of arsenic. You just take Avogadro's number (6.022 x 1023) and multiply 6.022 by the number of moles (155) and then multiply the product by 1023.
246 g
155 kilogram = 24.4 stone
155 mph is 249.448 kph
155 m = 508.53 ft
155 grams
155 grams is 5.47 ounces.
155 miles = 249.45 km
155 divided by 15 = 10.3333333
155 pounds = 11.07 stone.