25,1 grams sulfur contain 4,7147765.10e23 atoms.
Adding together the mass of two irons and three oxygen.....,251 grams Fe2O3 (1 mole Fe2O3/159.7 grams)= 1.57 moles iron II oxide ( also known as ferric oxide )===================================
Californium-251 decay by alpha emission.
251 NM
a double bond consists of a sigma bond and a pi bond .....pi bond is formed by sideways overlapping of unhybridized p-orbitals of two carbon atoms above and below the plane of carbon atoms..if now one of the carbon atoms of double bond is rotated with respect to the other ,the p-orbitals will no longer overlap and pi bond should break....but the breaking of pi bond requires 251 kj/mole of energy which is not provided by collision of molecules at room temperature...consequently the rotation about a carbon-carbon double bond is not free but is strongly hindered or restricted.... while in carbon-carbon single bond only 12.55 kj/mole of energy is reacquired (this data is for ethane molecule) .....at room temperature the collission of molecules supply sufficient kinetic energy to overcome this energy barrier
153 neutrons in the most stable isotope Number of neutrons = Atomic mass of an isotope - atomic number. Atomic mass of the most stable isotope of Cf is 251. Atomic number of Cf is 98.
251 grams = 0.251 kilograms
Amount of Fe = (2.71x1024)/(6.02x1023) = 4.50mol The atomic mass of Fe is 55.8 Mass of Fe = 4.50 x 55.8 = 251g
4
3.98406374501992 cans. Horray for calculators!
There are 1000 grams in 1 kilogram. If a can of soup weighs 251 grams, 4 cans will more or less weigh 1 kilogram.
Adding together the mass of two irons and three oxygen.....,251 grams Fe2O3 (1 mole Fe2O3/159.7 grams)= 1.57 moles iron II oxide ( also known as ferric oxide )===================================
2.51 kg = 2510 gTo convert from kg to g, multiply by 1000.
251 grams (g) = 0.251 kilograms (kg)Why? Because a kilogram is one thousand times bigger than a gram. So the answer in kg must be only one-thousandth of the mass in g.The simple way to divide by 1000 is to move the decimal point three places to the left.
There are 100 centimetres in one metre. Therefore, 251 centimetres is equal to 251/100 = 2.51 metres.
There are 12 inches in one foot. Therefore, 251 inches is equal to 251 / 12 = 20 feet 11 inches.
There are 10 millimetres in one centimetre. Therefore, 251 centimetres is equal to 251 x 10 = 2510 millimetres.
(251 x 7) + 5 = 1762 Answer: 251 with 5 remaining