the number of copper atoms in a 3.0g lump of copper is 2.8x1022 .how many electrons present in the sample ? and how do they contribute to its mass?

Q: The density of solid Fe is 7.87 g/cm³. How many atoms are present per cubic centimeter (cm³) of Fe?

A: a)  Density of Fe = 7.87 g/cm3  1 mol Fe = 56.0 g/mol  1 mol Fe = 6.023 × 1023 Fe atoms    The…

Q: What is the mass, in grams, of 8.55x1021 iron atoms? O 11.9g O 0.793 g O 1.26g 55.7g

A: Given: Number of iron atoms = 8.55 × 1021 atoms.

Q: How many silicon atoms are there in 1.00g of silicon?

A: Given: Mass of silicon=1.00 g Mass of 1 mole of silicon=28.0855  g

Q: (a) Describe Rutherford's experiment and how it led to the structure of the atom. How was he able to…

A: a)

Q: An 8.925 g sample of a compound containing only carbon, hydrogen, and oxygen gives 9.258 g of carbon…

A: Given : Mass of compound = 8.925 g Mass of CO2 produced = 9.258 g And mass of H2O produced = 5.351 g…

Q: How many atoms of Cu are existing in 2.36 g of copper wire?

A: Since molar mass of Cu = 63.546 g/mol Mass of Cu = 2.36 g (given)

Q: Calculate the mass of 1.00 x 1024 (a septillion) molecules of water.

A: Given : Number of water molecules = 1.00 X 1024

Q: What is the mass percentage of phosphorus in a sample of 8.53 phosphorus oxychloride containing a…

A: Mass percentage of phosphorus = 20.16 %

Q: the number of copper atoms in a 3.0g lump of copper is 2.8x1022. how many electrons are present  in…

A: the number of copper atoms in a 3.0g lump of copper is 2.8x1022.  The number of electrons present in…

Q: the number of copper atoms in 3.0 g lump of copper is 2.8 x 1022. how many electrons are present in…

A: Given: Number of copper atoms in 3.0 g lump of copper is 2.8 x 1022.

Q: (V,Os) (1.0 × 10º)- Calculate the mass of vanadium(V) oxide that contains a million vanadium atoms.

A: Given : number of V atoms = 1.0 × 106 atoms  To calculate :- mass of V2O5

Q: The density of solid Cr is 7.15 g/cm3. How many atoms are present per cubic centemeter of Cr?

A: Mass = Volume x density Number of moles = Mass/molar mass Number of molecules = 6.0224 x 1023 x…

Q: The number of copper atoms in a 3.0 g lump of copper is 2.8 x 10^22,how many electrons are pesent in…

A:

Q: 56.7 g of H,S reacts with 30.9 g of SO, according to this reaction + SO, 2H,S + So, = 35 + 2H,0 What…

A:

Q: What is the mass in grams of 6.022 * 1023 N atoms of mass 14.01 amu?

A: To determine the mass in grams of 6.022x1023 N atoms of mass 14.01 amu Given that: Mass of each atom…

Q: What is the mass of one atom of I? O 4.745 x 10-22 g O 3.443 x 10-22 g O 6.641x 10-23 g O 2.107 x…

A:

Q: How many atoms of O are found in 1.00 x 10 2 g of K 2Cr 2O 7 ?

A: Number of atoms of Oxygen present in the given compound can be calculated as -

Q: Without doing any calculations, determine which of the samples contains the greatest amount of the…

A:

Q: When 0.210 g of iron (atomic weight = 55.85 g/mol) is burned, 0.341 g of iron oxide is obtained.…

A: The symbol for iron is Fe The symbol for oxygen is O The molar mass of Fe is 55.85g/mol The molar…

Q: 1. What is the mass of 1.22 x 1022 molecules of silicon monocarbide? How many molecules are in 99.5…

A: 1) given, molecules of silicon monocarbide = 1.22×1022 molecules Avogadro's constant, Na =6.022 ×…

Q: Why must atomic masses be weighted averages rather than conventional average values?

A: atomic mass is mass of atom which have amu unit .

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: With the advent of techniques such as scanning tunneling microscopy, it is now possible to “write”…

A: Given:Surface is 20 atoms high and 14 atoms wide.Number of Platinum atoms = 20 atoms × 14 atoms =…

Q: Calculate the number of atoms in a 2.92 x103 g sample of boron.

A: Firat calculate number of moles.

Q: What is the percentage of nitrogen, by mass, in calciumnitrate?(a) 8.54% (b) 17.1% (c) 13.7% (d)…

A: Calcium nitrate is a compound of formula CaNO32. One mole of calcium nitrate contains two moles of…

Q: You have 3.31 L of water that contains 25 mg/L of PO43-. What is the total amount of phosphate in…

A: • The values provided in the question are:-    i) Density of phosphate ion solution,d  = 25 mg/L…

Q: Determine the mass (in grams) of aluminum present in 1.08 grams of Al2S3?

A: Molar mass of the elements is equal to the sum of the atomic masses of all the elements. Molar mass…

Q: The ratio of the mass of O to the mass of N in N2O3 is 12:7. Another binary compound of nitrogen has…

A: The given ratio of mass O to the mass of N in N2O3 is 12:7 Mass of O in N2O3 = 3x16 amu…

Q: Iron is found in Earth's crust as seve pounds. Calculate the mass (in kg) c contains 1.0 X 10° kg of…

A: Molecular-Mass: Molecular mass is the sum of atomic masses of the elements present in a molecule. It…

Q: How many copper atoms are present in a 2017 penny with mass 3.10 g? Modern pennies are 97.5% Zn and…

A: we have a penny of mass 3.10 gram. and it's also mentioned that in  a modern penny the percentage of…

Q: How many Sn atoms are there in a 20.7 gram sample of Sn ?

A: Avogadro's  number gives the number of atoms, molecules or ions in one mole of the substance and it…

Q: How many electrons is the element Strontium (Sr) likely to gain or lose?

A: Strontium is represented by Sr. The atomic number of Sr is 38. Sr Electronic configuration = [Kr]…

Q: Calculate the number of atoms in a 8.96 X 103 g sample of lithium

A: In a sample various numbers of atoms are present. These numbers depends upon mass of sample.

Q: Determine the mass percentage of carbon, C, hydrogen, H, and oxygen, O, in C,H2O6. R

A: Given :-  Molecular formula of glucose = C6H12O6  To be determined :-  Mass percentage of C, H and O…

Q: What is the mass of one atom of I? O 6.641 x 10-23 g O 4.745 x 10-22 g O 2.107 x 10 22 g O 3.443 x…

A: To determine the mass of 1 atom of I, do the following : 1) Determine molar mass of the substance.…

Q: Which element comprising Mg(OH)2 has the highest percentage by mass? RSK. Oxygen KRS. Hydrogen RKS.…

A: % w/w for an element in a compound = (mass of element/total mass of compound) × 100%

Q: 2. The volume of the nucleus of a carbon atom is about 9.9 x 10-39 mL. The molar mass of carbon…

A: Given: Volume of carbon nucleus atom = 9.9 × 10-39 mL. And molar mass of a carbon atom = 12.00…

Q: Determine the mass of 5.0x10^23 tungsten (w) atoms

A: One mole of any substance will have 6.023× 1023 . Therefore number of moles in 5.0× 1023 atoms,…

Q: A block of gold (Au) has the dimensions (I × b x h) = 0.7600 in x 8.558 mm x 1.816 cm. 1 in = 2.54…

A:

Q: how many atoms per particle in sulfur(s8)?

A: Atomic mass of sulfur = 32g Molecular mass of S8 =8×32=256g

Q: Calculate the mass (in kg) of 4.87 x 1025 atoms of Zn. O 8.09 kg 1.24 kg 5.29 kg 1.89 kg O 1.09 kg

A:

Q: Calculate the number of atoms in a 9.99 x 10 g sample of calcium.

A:

Q: A 67.2 gg sample of a gold and palladium alloy contains 2.68×1023 atoms. What is the mass percentage…

A: Mass percent of an element is the ratio of its mass  in the compound to the total mass of the…

Q: The U. S. Environmental Protection Agency (EPA) sets limits on healthful levels of air pollutants.…

A: The U. S. Environmental Protection Agency (EPA) sets limits on healthful levels of air pollutants…

Q: Calculate the number of atoms in a 2.33 x 10' g sample of silicon.

A: Avogadro’s number or Avogadro’s constant relates the molar mass and the physical mass of an element,…

Q: 7. A 25.75 g sample of a nitrogen oxide was found to contain 6.68 g nitrogen and the rest oxygen.…

A: Problem 7 % Weight of an element in a compound = 100 x Weight of element/Weight of compound Weight…

Q: A 67.2 g sample of a gold and palladium alloy contains 3.07×1023 atoms . What is the mass…

A: Given : Mass of sample = 67.2 g And total number of atoms = 3.07 X 1023 atoms Assuming the moles of…

Q: 9. Explain how the atomic mass unit (amu) is defined and explain how the definition of an amu, in…

A: amu i.e atomic mass unit is the unit used to express mass .  Avogadro's number = 6.0221 × 1023

Mole Concept

Mole concept is a method to determine the amount of any substance that consists of some elemental particles using a grouping unit called ‘mole’. The mole concept enables one to handle the large amount of small elementary particles. The mole concept can be used in many calculations related to mole calculation, molar amount, mole ratio, and so on, which are significant in chemistry.