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How many atoms are present in one gram atomic mass of a substance?
Wiki User
∙ 11y ago
Well, that depends on what substance it is. There's a way to figure it out, though, for every substance. On the Periodic Table, the Atomic Mass number for every element is the number of grams in 1 mole of that substance. 1 mole of every substance contains a constant number of representative particles, 6.02x1023. That's called Avogadro's number, and it's the most important constant in chemistry. Given a mass of a substance, it's a simple matter of finding out the number of atoms. For example, let's say you have 80 grams of calcium (Ca). Calcium's atomic mass is 40, and that means 40 grams per mole. You have 80 grams, so that's 2 moles. 1 mole of anything contains 6.02x1023 particles, so that number times your 2 moles get you 1.2x1024 atoms of calcium.
Wiki User
∙ 11y ago
Wiki User
∙ 11y agoOne mole - for example, 1 gram of hydrogen or 12 grams of carbon - has 6 x 1023 atoms. For more information, do some reading on "Avogadro's constant" and "mole".
Wiki User
∙ 11y agoGram Atomic Mass
Wiki User
∙ 11y ago6.022 X 10^23
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Which sample contains the same number of atoms as a gram atomic mass of he?
A gram atomic mass of helium (He) contains the same number of atoms as 1 mole of helium. Since 1 mole of any substance contains approximately 6.022 x 10^23 atoms, a sample of helium with a gram atomic mass would contain that same number of atoms.
Difference between Gram atom and gram molecule?
It's much simpler than you're probably thinking. You use the term gram atomic weight for atoms, and the term gram molecular weight for molecules. That's all. The gram molecular weight of a molecule is the sum of the gram atomic weights of the atoms making up that molecule.
Why does not atomic mass of element represent the actual mass of the atoms?
Because the gram atomic mass of an element is the mass in grams of Avogadro's Number of atoms. To find the actual mass of a single atom, the gram atomic mass must therefore be divided by 6.022 X 1023.
How many atomic mass unit 1 gram of a substance have?
1 atomic mass unit is 1.660538921(73)×10−27 kg. 1 gram contain 0,6022.1024 atomic mass units.
How is a mole related to the atomic mass?
The atomic mass, in grams, is the mass of one mole of atoms.
How many atoms are there in one gram of hydrogen?
It depends on the atomic mass of a substance. To find out, divide the 1 by the atomic mass of the element (found on the periodic table), then multiply by 6.02*1023. Ag=(1/Am)*6.02*1023 Where Am=atomic mass of the element, and Ag=the number of atoms in a gram.
Which sample contains the same number of atoms as a gram atomic mass of he?
A gram atomic mass of helium (He) contains the same number of atoms as 1 mole of helium. Since 1 mole of any substance contains approximately 6.022 x 10^23 atoms, a sample of helium with a gram atomic mass would contain that same number of atoms.
What is the percent of carbon in C2H12O6?
The formula given shows that each molecule of the substance contains two atoms of carbon, twelve atoms of hydrogen, and six atoms of oxygen. Therefore, the gram molecular mass of the substance is twice the gram atomic mass of carbon plus 12 times the gram atomic mass of hydrogen plus six times the gram atomic mass of oxygen. In numerical terms, this is [2(12.011) + 12(1.00794) + 6(15.9994)] or 132.11. (Only five significant digits are justified, because only five digits are given for the atomic mass of carbon.). Therefore the mass fraction of carbon in the substance is 24.022/132.11 or 0.18183. Multiplying by 100 yields 18.183 % of carbon in the substance.
How many atoms of sulfer are present in 155 grams of sulfer?
The atomic weight of sulfur is about 32.066. Therefore, 155 grams of sulfur contains 155/32.066 or about 4.83 gram atomic masses of sulfur to the justified number of significant digits. Each such gram atomic mass contains Avogadro's number of atoms, for a total of 4.83 X 6.022 X 1023 or 2.91 X 1024 atoms.
The molar mass of an element is equal to?
The element's average atomic mass.
Why is gram or kilogram not used in atomic mass?
bcause whwn we are talking about atoms we use atomic unit
Difference between Gram atom and gram molecule?
It's much simpler than you're probably thinking. You use the term gram atomic weight for atoms, and the term gram molecular weight for molecules. That's all. The gram molecular weight of a molecule is the sum of the gram atomic weights of the atoms making up that molecule.
How many atoms in one gram?
To find the number of atoms in a gram you must have the identity of the substance (the molar mass) and solve for the number of moles in 1 gram moles= 1gram / molar mass of substance # atoms = (moles)(Avogadro's number)
What does the atomic mass of an element tell?
The gram atomic weight or gram Atomic Mass of a chemical element is the mass in grams of Avogadro's number of atoms of the element with the isotopic proportions found in nature.
Why does not atomic mass of element represent the actual mass of the atoms?
Because the gram atomic mass of an element is the mass in grams of Avogadro's Number of atoms. To find the actual mass of a single atom, the gram atomic mass must therefore be divided by 6.022 X 1023.
How many atoms are in 127 g of calcium?
The gram atomic mass of calcium is 40.08. Therefore, 127 g of calcium constitutes 127/40.08 or 3.69 gram atomic masses. By definition of Avogadro's Number, each gram atomic mass contains Avogadro's Number of atoms. Therefore, the answer is 3.69 X Avogadro's Number or 1.91 X 1024 atoms, to the justified number of significant digits.
If you could count at the rate of 3 atoms per second how long would it take to count the atoms in 1 gram of Copper?
Wiki Answer to "http://wiki.answers.com/Q/If_you_could_count_at_the_rate_of_3_atoms_per_second_how_long_would_it_take_to_count_the_atoms_in_1_gram_of_Copper"Every substance on earth has an atomic or molecular weight. If one weighs out the atomic or molecular weight of a substance in grams it is called one gram molecular weight commonly called one gram mol. One gram mol of any substance contains 6.0221367 × 1023 atoms which in scientific notation is generally expressed as 6.02E23 atoms of that substance, E meaning the exponent on the number 10. This number is named Avogadro's constant after Amedeo Avogadro, an Italian scientist who first identified this quantity in 1811. 6.02E23 means 6.02 with the decimal point moved to the right 23 times! So the number is 602,000,000,000,000,000,000,000 atoms in one gram mol of any substance. The atomic weight of hydrogen, the lightest substance, equals 1.0079. So, 1.0079 grams of hydrogen is one gram mol and it contains 6.02E23 atoms of hydrogen. The atomic weight of copper is 63.546. If one weighs out 63.546 grams of copper, that pile is one gram mol of copper and it also contains 6.03E23 atoms of copper. So, only 1 gram of hydrogen contains the same number of atoms as 63.5 grams of copper! The question is about the time required to count the atoms in only one gram of copper at a rate of 3 atoms per second. One gram of copper would contain many less atoms than one gram mol (63.546 grams). That one gram would contain only 1/63.546 or 0.0157 gram mol of copper. So, multiply 0.0157 gram mol by 6.02E23 and the one gram would contain only 9.47E21 atoms of copper. To count the atoms, divide by 3 atoms per second; then divide by 60 seconds per minute; then divide by 60 minutes per hour; then divide by 24 hours per day; then divide by 365 days per year; then divide by 1000 years per millennium. The answer is that the calculation procedure will take1.00E11 millennia to count the atoms at 3 atoms per second or 1E14 years. That's one hundred trillion years . . . and that with no sleep and no food or water to interrupt the counting! Or, if you could count 100 billion atoms per second, you could finish in slightly less than 17 minutes! A person undertaking this project should at least consider his or her limitations! Sam and David Crowther, Austin, Texas November 27, 2008
