A modern penny weighs 2.5 g but is only 2.52% copper by mass. Calculate the number of cooper atoms in a penny.

Q: What is the mass percent of iron in iron(II) phosphide

A: Fe2P Molar mass of Fe2P=142.66gm/mole Atomic mass of Fe = 55.85gm/mole

Q: How many atoms of He can a balloon hold that has a 21 cm diameter hold? The density of Helium is…

A: Radius, r=diameter2=212=10.5 cm volume of spherical baloon…

Q: 0. present in a 20g sample of Sn Determine the number of atoms

A:

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: Consider a 0.336 gram sample of H20 and determine the hydrogen's mass.

A: given :-  mass of sample of water = 0.336 g  To calculate :-  mass of H in the sample of water

Q: How many titanium atoms are in a pure titanium bicycleframe with a mass of 1.28 kg?

A: The number of titanium atoms is in a pure titanium bicycle frame with a mass of 1.28 kg has to be…

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

A: The number of lead atoms can be calculated as follows:

Q: Calculate the number of atoms in a 4.70×1034.70×103 g sample of lithium.

A: 1 mol of a sample contains 6.02×1023 atoms. Number of moles of sample can be determined using the…

Q: Q/ calculate of the molar mass (Al2(OH)3 * ,Al=26.98, O=16,H=1

A: The molar mass is the weight of one sample mole. Connect the atomic masses (atomic weights) of all…

Q: Calculate the number of atoms in a 8.97×103 g sample of lithium.

A: The value is given as follows:

Q: Imagine you mix 16.05 g of methane (CH4) gas and 96.00 g ofoxygen (O2) gas and then ignite the…

A: First order reaction is a reaction that proceeds at a rate that depends linearly on only one…

Q: Name the following: CI, CIO, CIO, CIO ambined with other elements) I, (Br,I,N,CI,H,O,F.) NAMU

A: ate ----> ic  ite ----> ous  ide -----> hydro -ic  We have to name the following acid given…

Q: calculate the number of atoms of F in 32.5g of flourine gas, F2

A: Since moles of F2 = mass of F2 / molar mass of F2  molar mass of F2  = 38 g/mol Hence moles of F2  =…

Q: A pure silver sphere has a radius of 0.886 cm. How many silver atoms does it contain? (volume of a…

A: Calculate the volume of the silver sphere,      Volume of silver sphere = 43 π r3= 43 × 227 × (0.886…

Q: Calculate (a) the number of atoms in 1.05 × 10−6 mole of helium and (b) the number of moles of…

A: a.

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

A:

Q: When barium (Ba) reacts with sulfur (S) to form bariumsulfide (BaS), each Ba atom reacts with an S…

A: Since there are 1:1 ratio of atoms in the molecules, and it concludes that the same amount of each…

Q: Why do atoms combine? Justify your answer.

A: The arrangement of the electrons in an atom is known as electronic configuration. The outermost…

Q: Calculate the number of atoms present in a sample of 1.50 grams of silver (Ag).

A: Find the mole of silver that present in 1.50 grams of silver sample,

Q: Calculate the number of atoms in sample. 12.899 g Pt

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

Q: What additional information is needed in order to calculate a more accurate atomic weight for the…

A:

Q: Calculate the number of atoms in sample. 1.87 g Bi

A: Calculate the number of moles of Bi Number of moles of Bi = Given mass of BiMolar mass of Bi= 1.87…

Q: Calculate the number of atoms of iodine in a 7.88×10^6 g sample of iodine.

A:

Q: Consider 8.63 x 1021 atoms of boron.   How many moles of boron does this represent?

A: 1 mol of atom  = Avogadro's number

Q: The total number of atoms in CI2

A: Atom are the smallest unit of the chemical species. The total number of atom present in the…

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

A: Firat calculate number of moles.

Q: A given sample of xenon fluoride contains molecules of a single type XeFn, where n is some whole…

A:

Q: How many atoms are present in a Mg sample with a mass of 14.6 grams?

A:

Q: titanium

A: Molar atomic mass of Ti = 47.87 gmol-1  Mass of Ti = 1.00kg = 1000 g  Moles of Ti = ( mass / molar…

Q: calculate the number of atoms in 4.82 miles of magnesium

A: 1 moles of magnesium contains  Avogadro numbers of magnesium atoms       Avogadro numbers  =…

Q: How many Praseodymium atoms are present in 2.99 moles of Praseodymium ?

A: Given : 2.99 moles of Praseodymium ( Pr) Molecular weight of Pr = 140.91 grams

Q: How many grams of lithium will combine with 24.0 g of sulfur to form the compound LizS?

A:

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: How many V atoms are there in a 97.9 gram sample of V ? atoms

A: Mass of sample = 97.9 grams.  Number of atoms of V sample = ?

Q: an oxide of iron has the formula Fe3O4. what mass percent of iron does it contain?

A: Molar mass of Fe = 55.845 g/mol.Molar mass of O = 15.999 g/mol.

Q: Identify the type of reaction that is occurring in the video (represented by Darlene's equation…

A: The given reaction is, Pb(NO3)2 + 2KI → PbI2 +KNO3 To identify the type of reaction and to find, how…

Q: Calculate the number of atoms in sample. 39.733 g S

A: Given, Mass of Sulfur = 39.733 g

Q: By x-ray diffraction it is possible to determine the geometric pattern in which atoms are arranged…

A: Given that : The edge length of the cube = 0.409 nm The density of silver = 10.5 g/cm3 The molar…

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

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

Q: 2.43 g magnesium was completely burnt in oxygen to give magnesium oxide. 2 Mg(s) + O2(g) → 2 MgO(s)…

A: Answer: This question is based on the stoichiometric calculation from the chemical equation.

Q: Calculate the number of atoms in sample. 97.552 g Sn

A: We know that the 1 mole of a substance consists of 6.023*1023 number of atoms. (Mass of one mole of…

Q: How many atoms are present in a Mg sample with a mass of 10.6 grams?

A: Given, mass of Mg sample = 10.6 g Number of atoms present in 10.6 g of Mg sample = ? Note: molar…

Q: How many titanium atoms are in a pure titanium bicycle frame with a mass of 1.34 kg ?

A: Given that mass of titanium bicycle frame = 1.34 kg = 1340 g Molar mass of titanium (Ti) = 47.867…

Q: A chemist is testing for lead content in water samples taken downstream from a battery manufacturing…

A: We have to predict whether water is safe to drink or not.

Q: How many grams of lithium will combine with 21.3 g of sulfur to form the compound Li2S?

A: Given, mass of S = 21.3 g  Mass of Li2S = ?

Q: How many total atoms of all kinds are present in a 39 gram sample of CaF2?

A: Molar mass is the mass of 1 mole substance. Molar mass of CaF2 is 78.07 g/mol.

Q: A compound composed of tin (Sn) and oxygen (O) weighs 8.42 g. Decomposition of the compound produced…

A: mass of O = 8.42-6.63                    = 1.79 g

Q: Determine the number of each type of atom in formula. Al(NO3)3

A: Given formula: Al(NO3)3 The number of atoms of an element in a formula is same as its subscript. In…

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

A: Density is a physical quantity that can be determined with the help of the mass and volume of the…

Q: 1. Calculate the number of moles AND the mass in grams of a sample of Neon containing 2.790 X 1025…

A:

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.