A 20.0 g sample of an element contains 3.89 x 1023 atoms.

Q: What is distinctive about isotopes of elements, and why are they important?

A: The atomic number of an element is expressed as the number of protons and it is equal to the number…

Q: The mass of a "F atom is 18.998 u. What is its mass relative to the mass of an atom of "C? 19F 12C

A: Answer: Mass of one Fluorine atom=18.998u Mass of one Carbon-12 atom=12.0107u Ratio of their masses…

Q: What is the mass of 4.91×10214.91×1021 platinum atoms?

A: For  calculating the mass of substance , we have the governing equation  m=NA×Molecular weight ,…

Q: What are isotopes and how are they related to the atomic weight?

A: Isotopes are the compounds with same atomic number but different mass number. They have same number…

Q: Calculate the mass, in grams, of each sample.a. 1.1 * 1023 gold atomsb. 2.82 * 1022 helium atomsc.…

A: Given data: Avogadro's number NA, 6.023×1023atoms Convert first the number of atoms to moles using…

Q: . An element has three stable isotopes with masses of 27.977 amu, 28,976 amu, and 29.973 amu. The…

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Q: If the atomic mass of an element is X, what is the mass in grams of 1.027 x 1020 atoms of the…

A: Atomic mass of element (given)=X Number of atoms present =1.027×1020 atom

Q: To the right is a representation of 50 atoms of a fictitious element called westmontium (Wt). The…

A: A mass spectrum is an intensity vs. m/z (mass-to-charge ratio) plot representing a chemical…

Q: What is the mass of 100 platinum atoms?

A: Atomic mass, the amount of matter found in the element atom. It is expressed as a multiple of…

Q: A 4570 g sample of an element contains 5.009x10^25 atoms. Identify the element.  - Fe - V - Cr -…

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Q: if a penny is made of 2.56 grams of copper, how many atoms of copper are in the penny?

A: Answer:- This question is answered by using the simple concept of calculation of number of atoms…

Q: A sample of Aluminum foil contains 6.30 x 10^23 atoms. What is the mass of the foil

A: One mole of any substance contains 6.023 X 1023 units of that substance (atoms, ions or Molecules) .…

Q: The mass number of an atom is equal to the sum of which subatomic particles.

A: An atom is the smallest unit of ordinary matter that forms a chemical element and which can not be…

Q: What is an atomic mass unit? Why is it necessary to introduce such a unit?

A: Matters are the substances that possess some mass and volume. These are formed by joining very small…

Q: Which particles account for most of an atom’s mass?

A: Atoms are the fundamental unit of matter consisting of neutrons, protons and electrons.

Q: A sample of aluminum foil contains 7.50 x 1023 atoms. What is the mass of the foil?

A: Given :- no. of atoms of Al = 7.50 × 1023 atoms  To be calculated :- mass of Al foil (in g)

Q: 2.5 million atoms of particular element have a mass of 8.33X10^-16 grams. What is this element?

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Q: Which element accounts for roughly 75% of the observed mass of the universe? Which four elements…

A: Hydrogen is the most abundant element in the universe which aaccounts for roughly 75% of the…

Q: what are the grams in 6.15 x 10^22 aluminum atoms?

A: Ans  As we know that one mole of aluminium contains 6.023*1023 atoms So 23 g of aluminium contains…

Q: How many silver atoms are there in 3.84g of silver?

A: 1 mole of any substance contains 6.023×1023 atoms.1 moles of silver atoms weigh 107.87 g.

Q: Determine the number of atoms that would make up a 78.8 g sample of Tellurium.

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Q: Calculate the mass of 5.70×10225.70×1022 tungsten atoms.

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Q: If a penny is made of 2.56 grams of Copper, How many atoms of copper are in the penny?

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Q: Calculate the average mass, in grams, of one platinum atom.

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Q: How many grams of sulfur are there in 2.01 atoms of sulfur?

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Q: 5- Atoms of the same element with different mass numbers are called..

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Q: A 20.0 g sample of an element contains 4.95 * 1023 atoms. Identify the element.a) Cr…

A: The element has to be identified.

Q: Calculate the mass, in kg, of sample.  5.48x10^29 lithium atoms

A: Molar mass of lithium is 6.94 g/mol 6.023 x 1023 atoms have mass = 6.94 g of lithium

Q: If a sample of gallium contains 1.56×104 atoms of gallium-69 and 1.02×104 atoms of gallium-71, what…

A: Given,1.56×104 atoms of gallium 69.1.02×104 atoms of gallium 71.

Q: How many grams of Xe are there in a sample of Xe that contains 8.97×1023 atoms?

A: First we have to determine the moles of xenon.

Q: Calculate the mass, in kg, of sample.  7.55x10^26 cadmium atoms

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Q: Explain the difference between the mass number and theatomic mass of an element.

A: THE DIFFERENCE IS DISCUSSED BELOW :

Q: what is the mass of 7.15 x 10^22 aluminum atoms?

A: Given, Number of Aluminium atoms = 7.15×1022

Q: A 2.25 mol sample of an element has a mass of 51.8 g. What is the element?

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Q: If a sample of silver contains 1.29×104 atoms of silver-107 and 1.20×104 atoms of silver-109, what…

A: The percentage of silver-109 in the sample can be calculated by using the formula Percentage of…

Q: What is the mass in grams of 8.22 x1023 magnesium atoms, each having a mass of 24 amu? 1 amu =…

A: Since the number of atoms given is 8.22 x1023

Q: An element has three stable isotopes with masses of 27.977 amu, 28.976 amu, and 29.973 amu. The…

A: The average atomic mass of an element is calculated by considering the atomic mass of each isotope…

Q: What is the mass of 4.91x10^21 platinum atoms?

A: Given: Number of platinum atoms= 4.91×1021 we know that Molar mass of platinum=195.084 g/mol

Q: How many moles of neon would there be in 7.59 x 1025 neon atoms?

A: Given that : Atoms of neon = 7.59 x 1025 atoms Moles of neon =?

Q: What is the mass, in grams, of one argon atom ? 6.64x10^23g

A: The mass of one atom can be calculated by dividing molar mass by avagadro number.

Q: An 0.355 mol sample of a metal has a mass of 24.75 g. What is the mass of one atom of the element?…

A: Given: Moles of metal = 0.355 mol. And the mass of metal sample = 24.75 g.

Q: What mass (g) would 4.10 x 10^16 atoms Mg have

A: We have to determine the mass of 4.10×1016 atoms of Mg.

Q: What is the mass in grams of 8.22x10^23 magnesium atoms, each having a mass of 24 amu?

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Q: Give a Characteristics of an Atomic?

A: Solution-   An atom has three subatomic particles The nucleus has a well-charged atomic center and…

Q: A sample of aluminum foil contains 7.80×10237.80×1023 atoms. What is the mass of the foil?

A: Given that the number of atoms of aluminium is 7.80×1023 atoms. Number of moles of aluminium can be…

Q: Atoms

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Q: Bronze medals are made from an alloy composed of 93.8% copper, 5.1% tin, and 1.1% zinc (measured by…

A: Given : Mass % of copper = 93.8 % mass % of tin = 5.1 %  and mass % of Zinc = 1.1 % Assuming 100 g…

Q: A sample of aluminum foil contains 5.70 x 1023 atoms. What is the mass of the foil?

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Atoms and Molecules

An atom is the smallest unit of an element that possesses all the properties of that particular element. Molecules are the smallest unit of a substance that possess all the properties of that particular substance.