You think probable to praseodymium (141Pr).
Isotopes of other elements have also the same mass number.
The atomic number of cesium is 55. The number of neutrons is the isotope mass number minus atomic number, or in this instance 86 neutrons.
Atomic weight of fluorine = 6,022 141 78.1023 (Avogadro number) . 266,889 (the mass of atoms)/8,46.1024 (the number of atoms). The IUPAC 2005 atomic weight of fluorine is 18,998 403 2(5).
Atoms have atomic weight not molar mass. Any atom-gram has 6,022 141 29(27)×1023 (this is the number of Avogadro) atoms.
Atomic weight of silver: 107,868 2 u Avogadro's number: 6,022 141 79.1023 1 atom-gram of silver = 6,022 141 79.1023 silver atoms weight of 1 silver atom = 107,8682/6,022 141 79.1023 = 17,9119.1023 grams
Assuming the question refers to LiCl (Lithium chloride) which has a molecular weight 42.39. Avogadro's constant states there are 6.022 141 79x1023 molecules per mole 9.34 g LiCl is 9.34/42.39 mole (0.220 mole) LiCl The number of molecules is therefore 6.022 141 79x1023x 0.220 =1.326x1023 molecules
The atomic number of cesium is 55. The number of neutrons is the isotope mass number minus atomic number, or in this instance 86 neutrons.
- calculate the molecular mass of the substance from the atomic weights of the contained elements - 1 molecule gram of any substance contain 6,023 141 79.1023 molecules (Avogadro number) - mass of a single molecule is: Molecular mass in grams/Avogadro number
Atomic weight of fluorine = 6,022 141 78.1023 (Avogadro number) . 266,889 (the mass of atoms)/8,46.1024 (the number of atoms). The IUPAC 2005 atomic weight of fluorine is 18,998 403 2(5).
Lanthanum's atomic number is 57 thus it has 57 protons, the number of protons an atom has is equal to the atomic weight, in this case 141 minus the number of protons or 57 so, 141-57=84 Lanthanum-141 has 84 neutrons.
Each isotope of an element has a different number of neutrons. Number of neutrons = Atomic mass of an isotope - atomic number of the element For uranium the atomic number is 92; for the isotopes see the list of isotopes with their atomic mass.
Atoms have atomic weight not molar mass. Any atom-gram has 6,022 141 29(27)×1023 (this is the number of Avogadro) atoms.
A mole is the amount of a substance that contains as many atoms, molecules, ions, or other elementary units as the number of atoms in 0.012 kilogram of carbon 12. The number is 6.0225 × 1023, or Avogadro's number. Molar mass is the mass of one mole of a substance.
Chemical formula of water: H2O Atomic weight of oxygen: 15,9994 Atomic weight of hydrogen: 1,oo794 Molecular mass of water: 18,01528 Number of atoms in 15,9994 g oxygen = number of Avogadro = 6,022 141 79.1023
For this you need the atomic (molecular) mass of NaCl. Take the number of grams and divide it by the atomic mass. Multiply by one mole for units to cancel. NaCl=58 grams 25.0 grams NaCl / (58 grams) = .431* moles NaCl *approximation
To find the mass of an atom you divide the constant known as Avagadro's number 6.022X10^23 by the amu of an element. So lets take oxygen for example. The amu of Oxygen is " 15.99" , so you would divide 15.99 by 6.022X10^23. By doing this you will get the mass of one Oxygen atom.
1 pound =.4536 Kg 141 pound=(141)(.4536) Kg =63.9576 Kg so ypur mass is 63.9576 Kg.
141 kilograms = 310.9 (310.85179) pounds.