What mass of copper contains the same number of atoms as 68.7 g or iron?
912515
Since 56 is the atomic mass of iron then the amount here is 68.7/56 moles or 1.23 moles.\nSince 1 mole of copper is 64 g then to have 1.23 moles you need 64 X 1.23 or 78.5 g.\nThe trick is that equal numbers of moles have equal numbers of atoms.
532621
i believe that iron makes up a larger percentage of earth's mass than any other element. however, it is not often found in elemental form, usually it is an ore, as a compound with oxygen, sulfur, and other elements.
107880
The atomic mass is equal (approximately) to the number of protons plus the number of neutrons.  The atomic number indicates the number of protons.  So atomic mass is atomic number plus the number of neutrons in the atom.
482317
Atomic wt of Al is 13,Cu is 29,Zn is 30 and Fe is 26.So less atomic wt,Al contains more number of atoms in 50gm
437503
Q = m.s.ΔT\nHeat loss by the copper = heat gained by the metal.\nCopper (heat loss) = 200.0g x 0.38J/g.ºC x (195.5ºC-228.4ºC) = -2500.4J\ndivide the heat by the mass and ΔT of the metal to get the specific heat of the metal:\n2500.4J/(65.0g x (195.5ºC-18.3ºC)) = 0.2171 = 0.21 J/g.ºC (correct SF)
21513
Take a look at any good Periodic Table of the Elements.  Here's a good one:\n\nhttp://www.webelements.com/\n\nThe number given under atomic weight. is given in standard atomic mass units (defined by taking the mass of a carbon-12 atom, and dividing it by 12).  For all practical purposes, we can assume that it is the mass of a proton/neutron (which again, for all practical purposes, we can assume have the same mass; we neglect the mass of electrons because the mass of an electron is about 1/3000 that of a proton or neutron).  \n\nFor example, the atomic mass of hydrogen is 1.  This is because hydrogen consists of 1 proton orbited by 1 electron.  However, on the perodic table, you will notice that the number is actually 1.00794.  This is bcause this number is the average of all isotopes.  An isotope is an element that has a different number of neutrons.  For example, a hydrogen atom with one proton and neutron in the nucleus, and an electron orbiting it is still hydrogen, but is known as deuterium (It is still defined as hydrogen by the number of protons in the nucleus), but has an atomic mass of 2. The other isotope of hydrogen (Tritium) has 2 neutrons in the nucleus and an electron orbiting it (an atomic mass of 3). Because these isotopes are so rare, the average mass of all existing hydrogen is close to 1, but is slightly higher.\n\nYou can find mass in Kg by dividing the atomic mass by avogadro's number (6.02 X 10^23).  There are 6.02X10^23 atomic mass units in 1Kg.
864891
The isotopic notation is just the mass number (proton + neutron) before the chemical symbol. Since copper has an atomic number of 29 then the isotopic notation respectively, \n63Cu\n\n65Cu
799181
The atomic mass of nitrogen is 14.00674 grams/mole and the atomic mass of calcium is 40.078 grams/mole.  At a level of accuracy of  four significant figures, the masses you have been given correspond to the mass of one mole of each of these elements.  Therefore, there is one mole of nitrogen atoms in 14.01 gms of N and one mole of calcium atoms in 40.08 gms of Ca.\n\nOne mole of atoms  = 6.022 * 10^23 atoms.
62704
Atomic Mass: 58.9332 Amu
840490
One way to count atoms is by using the molar unit.\nSince different atoms have different weights (masses) the molar quantity of different elements will have different weights.  However, the molar quantity will have the same number of atoms - 6∙02 x 10^23.  This number value is known as Avogadro Constant.\n\nExamples:\n Hydrogen: 1 mole = 1g and contains 6∙02 x 10^23 atoms.\n Oxygen : 1 mole = 16g and contains 6∙02 x 10^23 atoms.\n Water :  1 mole = 18g and contains 6∙02 x 10^23 molecules.
291470
Yes, you are correct. The atomic number of Molybdenum is 42.
702529
Name: Iron \nSymbol: Fe \nAtomic Number: 26 \nAtomic Mass: 55.845 amu \nMelting Point: 1535.0 °C (1808.15 K, 2795.0 °F) \nBoiling Point: 2750.0 °C (3023.15 K, 4982.0 °F) \nNumber of Protons/Electrons: 26 \nNumber of Neutrons: 30 \nClassification: Transition Metal \nCrystal Structure: Cubic \nDensity @ 293 K: 7.86 g/cm3 \nColor: Silvery
462911
relative atomic mass of magnesium (Mg) is 24.5
928163
See the link\n\nfoi iron Z=26  this is the formula of the distribution of electrons on shells and subshells\n\n1s2 \n2s2 2p6\n3s2 3p6 3d6\n4s2
46078
copper is one of many "transiton metals" which means it is one of the elements in the middle-lower part of the periodic table - groups 3 to 12, also called the d-block because they have electrons that occupy d orbitals.  other transition metals include zinc, magnesium, mercury, iron, gold, silver - altogether there are 40 of them.\n\ncopper is shiny, red-orangish in color, and is a very good conductor of both heat and electricity.
759463
Atomic masses\nCu - 63.546g/mol\nN - 14.007g/mol\nO - 15.999g/mol\n\nmolar mass of Cu(NO3)2 - 187.554g/mol\n\nno of moles in 2.35x10^3g = 12.53
973894
float as mercury has a density of about 13.6gm/cc and iron much lesser 7.85gm/cc. Mass is immaterial as  in a sufficient quantity of mercury even a 1000000000000kg iron ball will float