An unknown element X has the following isotopes: ¹⁰X (20.00% abundant) and ¹¹X (80.00% abundant). What is the average atomic mass in amu of X?

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: Explain clearly what is meant by the statement “The atomic mass of gold is 197.0 amu.”

A: “The atomic mass of gold is 197.0 amu.” The explanation of the above statement has to be given…

Q: v, the number of v of Rf is 104 and its v is 267. Therefore the number of protons is One of the…

A:

Q: How many grams are in moles of F? Atomic weight of F is=19.00

A: Answer :-  Grams in moles of F = 19.00 g…

Q: On earth, tin has 10 different stable isotopes. The heaviest, 124Sn makes up 5.80% of naturally…

A: Grams of 124Sn present in 38.3 g sample     = 38.3*(5.80/100)= 2.22 g

Q: What is considered to be the molar mass? O the mass, in grams, of one mole of elements of a single…

A: Option 1st will be correct.

Q: How many atoms of neon are present in 1.30 moles of neon?

A:

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 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: What mass of ammonia gas (NH3) contains 2.81 ✕ 1024 hydrogen atoms?

A:

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: The atomic mass of aluminum is 26.982u. How many alluminum atoms are in a 4.55g sample of aluminum?

A: Mass of aluminium sample=4.55 g The atomic mass of aluminum =26.982 u Moles of aluminium=4.5526.982…

Q: Assume the atomic mass of element X is 22.99 amu. A 22.42−g sample of X combines with 123.73 g of…

A: Mass of X = 22.42 g Mass of Y =123.73 g Atomic mass of element X = 22.99 amu Atomic mass of element…

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: There are 6.02x1023 atoms in one mole of any element. Assuming that the titanium rod in the question…

A: Given that, Number of moles of titanium = 4.70 moles

Q: What amount, in moles, does this mass represent?

A: Number of moles = mass/molar mass  Molar mass of methanol is 32.04 g/mol

Q: The density of helium in a balloon is 1.18 g/L. If a balloon holds 2.99 L of He, how many atoms of…

A:

Q: Diamond is one form of an elemental carbon. An engagement ring contains a diamond weighing 1.25…

A: Given, Diamond is one form of an elemental carbon and an engagementring contains a diamond weighing…

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: The Japanese symbol for an atom has been written on a piece of copper metal using 99 iron atoms.…

A: 1 mol = 6.022×1023 [Avogadro's number]  The mass of one mole of atoms of an element is known as its…

Q: A sample of cyanic acid, HCN, contains  3.33 x 1022 atoms. a. How many moles of cyanic acid are in…

A:

Q: 3.123 In the formation of carbon monoxide, CO, it is foundthat 2.445 g of carbon combine with 3.257…

A:

Q: A toy top has a mass of 32.0 g Cu. How many atoms Cu are in this spinning top, given that the…

A: We know , in 1 mole of any atoms , there is avogadro number of atoms i.e. 6.022×1023 number of…

Q: A toy top has a mass of 32.0 |g Cu . How many atoms Cu are in this spinning top, given that the…

A: Given, mass of copper (Cu) =32.0 gatomic mass of copper (Cu) =63.55 gmolwe are asked to calculate…

Q: What is the mass of a mole of electrons if one electronhas a mass of 9.11 × 1 0 -28 g?

A: Because, 1 mole=6.022×1023 molecules/particles Therefore, 1 mole of electron=6.022×1023 electrons

Q: According to the law of multiple proportions, if 12 g of carbon combine with 16 g of oxygen to form…

A: According to the law of multiple proportion, two atoms combining in different ratios to form…

Q: A toy top has a mass of 32.0 g Cu. How many atoms Cu are in this spinning top, given that the…

A: Given information: Mass of Cu = 32.0 g Molar mass of Cu = 63.55 g/mol

Q: 4. How many atoms of Iodine are contain ed in a sample of Iodine that has a mass of 1.247 x 105 amu?

A: Introduction: An atomic mass unit is a unit used to express the relative maases of atoms.One atomic…

Q: How many moles of N are there in a sample of N that contains 2.75×1024 atoms?

A:

Q: any atoms of cesium are in 10.1 grams ium phosphate? 1

A: Cesium phosphate Cs3PO4 molar mass = 494 g/mol Moles of Cs3PO4=mass/molar mass    = 10.1/494 =…

Q: A toy top has a mass of 32.0 g Cu. How many atoms Cu are in this spinning top, given that the…

A:

Q: Calculate the mass of each sample. a. 1.05 × 10²26 atoms of neon, Ne(g)

A: 1 mole of atom = 6.022 × 1023 atoms

Q: 23 atoms of magnesium? 1. How many moles of magnesium is 5.61 x 10

A: moles of any species is defined as when given mass of species divided by its molar mass

Q: A 0.632 mol sample of C6H8X2 has  mass of 90.07g identify X indicating the symbol and not the name…

A: The element can be identified by its molar mass. The molar mass of the elements X can be calculated…

Q: Aluminum bronze is a mixture of 92.0% copper (Cu) and 8.0% aluminum (Al) by mass. What percent of…

A: Given : Mass percent of Al = 8.0 % And mass percent of Cu = 92.0 % Assuming 100 g of mixture. Hence…

Q: A gold ring contains 3.01 x 1023 atoms of gold, Au. How many grams of gold are in the ring?

A: The number of moles (n) of a substance is calculated by dividing its number of atoms (No) by…

Q: How many Ge atoms are there in 3.96 moles of Ge?

A: The formula we are going to use is Number of atoms of any element = number of moles X Avogadro's…

Q: What amount of CuSO4•5H,O, in moles, does this mass represent? mass = 1.787 g %3D X mol resubmit…

A: Given : Mass of CuSO4.5H2O = 1.787 g And molar mass of CuSO4.5H2O = 249.69 g/mol.

Q: How many grams of He are there in a sample of He that contains 8.76x1023 atoms? grams

A:

Q: How many moles of aluminum do 1.42 x 10^24 aluminum atoms constitute?

A: 1 mol of any atom has 6.023 ×1023 number of atoms .

Q: How many atoms (total) are present in a 3.45 x10-2 m3 sample of Al2O3, which has a density of 3.95…

A:

Q: What is the average mass of the atoms ? (Copper-63 has a mass of 62.92960 amuamu, and copper-65 has…

A: The average atomic mass of the element is defined as the sum of the mass of all the isotopes present…

Q: Assume that for the following molecules, carbon=12 amu, hydrogen= 1 amu, nitrogen= 14 amu and…

A: • Molecular oxygen is a diatomic molecule consists of two oxygen atoms held together by a covalent…

Q: 49.4g of Cr represents how many atoms?

A: Number of Atoms = moles of Atom X Avogadro's number  Avogadro's number  = 6.022 X 1023  And moles of…

Q: How many atoms are in 5.80 moles of He?

A: Given : Moles of He = 5.80 mol.

Q: How many moles of boron, B,B, are in 1.69×1024 B1.69×1024 B atoms?

A: Consider the given information is as follows; Number of boron (B) atoms = 1.69×1024           Moles…

Q: How many lithium atoms are present in 49.17 moles of lithium?

A: 1 mole contains 6.022 ×1023 atoms

Q: = How many moles are there in 91.1 g of uranium, U?

A:

Q: xplain how the atomic mass unit (amu) is defined and (ii) explain how the definition of an amu in…

A: A Unit of mass is used to explain the atomic weight....i. e amu. Atomic mass is the quantity of…

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.