The atomic masses of 10B and 11B are 10.0129 amu and 11.0093 amu, respectively. Calculate the natural abundances of these two isotopes. The average atomic mass of B is 10.811 amu. 10B =  11B =

Q: Strontium has 4 isotopes: Sr84 with 0.56% abundance and AMU of 3.9134, Sr86 9.86% abundance with AMU…

A: Let x 1 and x2 be the abundance of Sr87 and Sr88 respectively. Then we have Strontium Isotopes…

Q: Silver has two naturally isotopes and has an atomic mass of 107.868 amu. One isotope is Ag-109…

A:

Q: What is the mass in grams of 3.61 x10^23 atoms of copper?     How many copper atoms are there in…

A: The atomic mass of an element is used to determine the number of moles of an element. One mole of…

Q: An unknown element is a mixture of isotopes ¹²⁰X and ¹²²X. The average atomic mass of X is 120.48…

A: Given:  average atomic mass of X = 120.48 amu. isotopes ¹²⁰X and ¹²²X To find: percent abundance of…

Q: 7- The oxidizing agent in the following chemical reaction is +2 5Fe + MnO (aq) + 8H (aq) - Ma + 4H,0…

A: “Since you have asked multiple question, we will solve the first question for you. If you want any…

Q: You have a compound with the formula X₂Y. X is an isotope with a mass of 20g/mol and Y is an isotope…

A: Mass of X = 20 g/mol Mass of Y = 43 g/mol

Q: How many moles of silver atoms do you have if you have 2.15 × 10²¹ atoms of silver. (The mass of one…

A: Number of moles (n) is given by- n= given mass/molar mass Or n= given no. of particles/Avogadro…

Q: The atomic masses of 203Tl and 205Tl are 202.972320 and 204.974401 amu, respectively. Calculate the…

A: Let the isotope of Tl203 be x. Let the isotope of Tl205 be (1-x). Set up the equation.…

Q: Silicon has three stable isc mu). The ratio of the abund maturally occurring sample- erage atomic…

A: The objective of the question is to determine the average atomic mass that emerges when all the…

Q: Bromine has two naturally occurring isotopes (Br-79 and Br-81) and has an atomic mass of 79.904 amu.…

A: The given data contains, Atomic mass of Br = 79.904 amu. mass of isotope 81Br = 80.9163…

Q: Calculate the mass, in grams, of 262 atoms of cesium, Cs (1 mol of Cs has a mass of 132.91 g).

A: Molar mass = 132.91g I mol of Cs contains 6.022×1023atoms  Therefore mass of 6.022 × 1023 atoms =…

Q: The atomic masses of 6 Li and7Li are 6.0151 amu and 7.0160 amu, respectively. Calculate the natural…

A: The natural abundance of the heaviest isotope is to be calculated.

Q: If you have 13.02 x1023 atoms of nitrogen, what would you expect its mass to be?

A: Given, Number of Nitrogen atoms = 13.02 X 1023

Q: he average atomic masses of some elements may vary, depending upon the sources of their ores.…

A: Explanation Solution Two substances, the percentage of each isotope, are unidentified. As both…

Q: Calculate the mass of 5.70 X 10^22 tungsten atoms.

A: Given No of atoms of tungsten = 5.70 x 1022   Also, Molar mass of tungsten =  183.84 g

Q: Calculate the mass (in g) of 2.0x10^24 atoms of Pt.

A: Given, number of atoms of Pt = 2.0 x 1024 atomsWe know, => moles of Pt = number of atoms of Pt /…

Q: Iron exists in nature as a mixture of predominantly three isotopes: ⁵⁴₂₆Fe (53.94 amu), ⁵⁶₂₆Fe…

A: We have to calculate the percentage of rarest of three isotopes.

Q: The natural abundance of the three stable isotopes are 90.92% isotope A (19.9924 amu), 0.3104%…

A:

Q: Copper has two naturally occurring isotopes, 63 Cu(62.9396amu)and 65 Cu(64.9278amu). If copper has…

A: %abundance of cu63= |63.546-64.9278|÷|64.9278-62.9396| So solve it  and  27% Cu63 Same for CU65= 73%…

Q: An atom consists of two isotopes, the first with an atomic mass of 15.8967 amu and the second with…

A: Atomic mass of first Isotope = 15.8967 amu Atomic mass of second Isotope = 16.8245 amu Average mass…

Q: What is the mass of 3.30 x 1023 atoms of silver, Ag? 25.8 g 59.1 g 85.7 g 197 g 0.549 g

A: We will use formula of mole and mass to get answer. Number of atom = 3.3×1023

Q: A 6.55 g sample of calcium sulfide was decomposed into its constituent elements, producing 3.64 g of…

A: According to the law of constant composition, for any particular chemical compound, all samples of…

Q: How many moles of silver atoms do you have if you have 2.76 × 10²¹ atoms of silver. (The mass of one…

A:

Q: 7.53 × 10^23 molecules of an element has a mass of 88.64 g. What is the identity of this molecular…

A: 7.53 × 1023 molecules of an element have a mass of 88.64 g. This molecular element is to be…

Q: Unknown element, Element X, exists in nature as two isotopes: ^{351}351 X has a mass of 350.9196 u…

A: Average atomic mass=∑i=1n (mass of ith isotope)(%abundance of ith isotope)100 where 'i'…

Q: An unknown element is a mixture of isotopes ¹²⁰X and ¹²²X. The average atomic mass of X is 121.47…

A: For an element that exists as a number of isotopes, its atomic mass is calculated by taking an…

Q: The atomic mass of bromine is 79,904 amu. The atomic mass of the Br-81 isotope is 80.9163 amu and…

A: The atomic mass of bromine is 79.904 amu. This is actually the average atomic mass of Bromine which…

Q: The three isotopes of a naturally occurring mystery element X are 39X, 38.963707 amu; 40X, 39.963999…

A: Isotopemasspercent of natural abundance39X38.963707 amu93.2581 %40X39.963999 amu[100 - (93.2581 +…

Q: There are only two naturally occurring isotopes of Copper, 63 Cu and 65 Cu. Copper has an atomic…

A:

Q: When a 220 g sample composed of ibuprofen (C13H1802) and some inert material is added, the mass of…

A: The mass percentage of an element in a given compound is a measure of the amount of the element…

Q: Element X has two isotopes, 28Q and 30Q. The relative atomic mass of X is 28.24. (a) Define the…

A:

Q: Determine the mass in grams of 7.75 x 1021 atoms of carbon. (The mass of one mole of carbon is 12.01…

A: Given,the mass of one mole of carbon = 12.01 gNumber of carbon atoms = 7.75×1021 atomsHere, we are…

Q: Natural rubidium has the average mass of 85.4678 u and is composed of isotopes85Rb (mass = 84.9117…

A: Mass of the Rb = 86.913 amu. Given data: 85.4678 amu is average mass of the Rb Mass of 85Rb =…

Q: What is the chemical formula of carbon tetrafluoride?

A: The compound given is carbon tetrafluoride.

Q: Calculate the mass, in grams, of 602 atoms of cesium, Cs (1 mol of Cs has a mass of 132.91 g).

A: Given information: 602 atoms

Q: (a) An element has three naturally occurring isotopes with the following masses and abundances:…

A:

Q: For which element does a sample of 1.5055 × 1024 atoms have a total mass of 70.215 g? P, Si, S

A: Number of atoms = 1.5055 × 1024 atomsmass = 70.215 gIdentify the element present in the sample,• P•…

Q: At some point in the future, nuclear chemists have synthesized two stable isotopes of bohrium.…

A: Since average mass of the element is given so we can easily calculate the fraction of each isotope…

Q: Determine the mass of 3.01 × 10^20 atoms of Sulfur.

A:

Q: In Part I (A) reactions how did you decide what (compound) precipitated?

A: In each of the cases in Part I (A), the precipitated compound is predicted.

Q: How many neutrons are in 37.0 ug ( ug= 10^-6 g) of 14 6 C?

A: Given :- mass of 6C14 is 37.0ug  1ug = 10-6 g  To be calculated :-  Total number of neutrons

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: A cylindrical piece of pure titanium (Ti, density=4.506 g/cm^3) has diameter d=1.15 cm and length…

A:

Q: Silicon (average atomic mass=28.0855amu) has three isotopes. Their masses are 27.9769amu,…

A: Given mass of silicon isotope = 28.0855 amu % abundance of highest isotope i.e  29.9738 amu = 2.96 %…

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.