Since the penny was minted in 1969, only 95.00% by mass of the penny is copper. If the had a mass of 3.110 g, what is the mass of copper in the metal? penny How many moles of copper metal are in the penny? How many atoms of copper are in this many moles of copper?

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: How many moles of He are 221,000 He atoms?

A: Mole concept: The number of molecules or atoms present in the one mole of the substance is equal to…

Q: Calculate the number of atoms in 2.8 mol of Barium.

A: 1 mole of any substance has number of atoms or molecules equal to Avogadro's number in it.

Q: iron

A: Atomic mass of Iron = 56 g/mol Given mass of iron bar = 36.2g Number of moles in iron bar is…

Q: A Canadian penny contains 0.106 mol of copper. How many atoms of copper are in a Canadian penny

A: Given, Number of moles of copper in Canadian penny  = 0.106 mol

Q: The density of helium in a balloon is 1.18 g/L. If a balloon holds 2.89 L of He, how many atoms of…

A: Since mass of He = density X volume  density of He = 1.18 g/L Volume of balloon = 2.89 L => mass…

Q: How many moles of Si are there in a sample that contains 10.4 grams of silicon? How many grams of…

A: 1.Mass of silicon = 10.4g Moles of silicon =?2. Moles of silicon = 4.20 molMass of silicon in grams…

Q: What is the mass of 3.80 moles of waterThe atomic mass of Hydrogen is 1.00 amu and that of Oxygen is…

A: First we need to calculate mass of 1 mole of water using the given atomic mass units.  Then we can…

Q: The density of helium in a balloon is 1.18 g/L. If a balloon holds 2.91 L of He, how many atoms of…

A: Calculation of mass of Helium: Mass=Volume×density=2.91 L×1.18 g/L=3.4338 g Calculation of no. of…

Q: The density of helium in a balloon is 1.18 g/L. If a balloon holds 2.95 L of He, how many atoms of…

A: It is given that :Density of helium in a balloon = 1.18 g/LVolume = 2.95 L

Q: How many moles are in 11.9 grams of argon (Ar)?

A:

Q: The density of helium in a balloon is 1.18 g/L. If a balloon holds 2.93 L of He, how many atoms of…

A: The mass of the species can be defined as the product of the density of the species and the volume…

Q: How many copper atoms do you have in 2.50 moles of copper atoms

A: Moles of copper = 2.50 mol 1 mol of copper contains 6.02×1023 copper atoms Hence 2.50 mol Cu has…

Q: 21.4 g Ar How many moles of atoms are in each elemental sample?

A: Given  Mass of Ar = 21.4 g

Q: How many grams does 7.5 moles of carbon dioxide weigh?

A: How many grams does 7.5 moles of carbon dioxide weigh? We know that Mass of one mole of any…

Q: given a 81.9 mol sample of Ne, how many atoms are present?

A: 6.023 × 10^ 23 is called Avogadro's number. One mole of any substance contain Avogadro's number of…

Q: How many atoms are in 11 mol of helium?  how many atoms are in 102.1 of sodium?

A: Given that,    Moles of Helium = 11 moles    one mole of helium contains = 6.023×1023 atoms   Helium…

Q: How many grams of F are there in 4.29 moles of F?

A:

Q: Write a balanced chemical equation for the formation of magnesium oxide form magnesium metal  and…

A: When magnesium is burnt in the air, it results in the formation of magnesium oxide.

Q: atoms

A:

Q: how many atoms of F in 2.62 mol of F2

A: Given :- no.of moles of F2 = 2.62 mol  To be calculated :- number of F atoms

Q: 1. How many moles of Sc are there in a sample that contains 14.6 grams of scandium? moles 2. How…

A: The moles and mass of the element are related to each other by the formula given below as;…

Q: how many atoms of scandium are in 7.54 moles of scandium

A: According to  Avogadro,  1 mol of scandium has 6.023 x 1023 number of atoms  Then 7.54 mols of…

Q: How many grams of oxygen are combined with 94 grams of iron to make the iron(II) oxide compound?

A: Given: Oxygen is combined with iron to give iron(II) oxide. Mass of iron = 94 grams.

Q: how many atoms are in 5.12 moles of Sulfur?

A: The objective of this question is to find out the number of atoms in a given amount of moles of a…

Q: Which has more atoms: 3 moles of Magnesium or 3 moles of Calcium?

A: It is used to count particles.1 mole = Avogadro's number. (NA). The number of atoms/ molecules…

Q: What is the mass of a sample containing 1.00 mol of atoms, 33% of them N and 67% of them O?…

A:

Q: If 4.00 g of the unknown compound contained 0.133 mol of C and 0.267 mol of H, how many moles of…

A: Given data :  1. Mol of carbon = 0.133 mol  2. Mol of H = 0.267 mol

Q: How many grams of gold are there in 0.413  moles of gold?

A: Given: Moles of gold = 0.413 mol. Atomic mass of gold is 197 g/mol.

Q: 15 How many atoms of Aluminum are in 6.95 moles of Aluminum?

A:

Q: How many atoms of Krypton are in 3.13 moles of Krypton?

A: The formula of Krypton is Kr Hence there is only 1 atom of krypton.

Q: How many atoms are in 9.35 moles of lithium?

A: In chemistry, a mole is a unit of measurement used to express amounts of a chemical substance. It is…

Q: If you have 1.4 moles of silver, what would be the mass of silver?

A: Given, moles of Silver (Ag) = 1.4 moles to find : mass of Ag.   Solution : We know that, Atomic mass…

Q: If you have 2.01 kg of Ar how many moles of Ar do you have

A:

Q: How many moles are in a 331.839 g sample of an element with a molar mass of 178.68 g/ mole?

A:

Q: When a 19.34 gram piece of lithium is placed in a sample of water, how many grams of hydrogen gas…

A:

Q: How many atoms does oxygen have in one mole of oxygen? 6.6 6.02E-23 3.14E-23 2.2

A: How many atoms  are present in one mole of oxygen  Solution is given below in next step

Q: You have 73.56 g of silver nitrate.  How many moles of oxygen atoms are present

A: One molecule of nitrate ( AgNO3 ) contains three atoms of oxygen.  Molar mass of AgNO3 = 169.87…

Q: Erbium (Er) is element 68 on the periodic table. A sample contains 2.58×1025 atoms of Er. Calculate…

A:

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…

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.