An unknown element X has the following isotopes: 126X (22.00% abundant), 128X (34.00% abundant), 130X (44.00% abundant). What is the average atomic mass in amu of X?

Q: 16.The atomic masses of * Cl (75.53 percent) and "Cl (24.47 percent) are 34.968 and 36. 956 a.m.u.,…

A: Introduction: Chlorine belongs to group 17 elements with atomic number 17 and mass 35.45 amu. Group…

Q: Determine the atomic mass (in g/mol) of an isotope using the following info: mass of an isotope…

A: Answer: First of all we will find out the number of moles in 2.97×1022 atoms. After that, by using…

Q: An unknown element is a mixture of isotopes 120X and 122X.  The average atomic mass is 120.70.  What…

A: Suppose percentage abundance of 122X = A percentage abundance of  120X = (100 - A) Fraction of 122X…

Q: 4. Copper is found in nature as two isotopes, 63Cu (69.0%) with a mass of 62.93 amu and 65Cu (31.0%)…

A: Average atomic mass of copper can be determined using the following equation.

Q: Naturally occurring copper consists of 63Cu (mass 62.9296 amu) and 65Cu (mass 64.9278 amu), with an…

A:

Q: One way in which Earth’s evolution as a planet can be understood is by measuring the amounts of…

A:

Q: There are three isotopes of an element, X-28, X-29, and X-30, with relative abundances of 92.2297%,…

A: Given  molar mass of X1 = 28 with abundance 92.2297% molar mass of X2 = 29 with abundance 4.6832%…

Q: During nuclear decay a 238 U atom can break apart into a helium 4 atom and one other atom. Assuming…

A: In the problem statement it is given that 238U undergoes nuclear decay to give a helium-4 atom and…

Q: A hypothetical element, E, has two stable isotopes. One isotope has a natural abundance of 66.909%…

A:

Q: Calculate the mass of each isotopes of Calcium (40Ca, 43Ca, 44Ca, 46Ca, and 48Ca) if we have 40.08…

A: Given, we have 40.08 atomic mass and they exist naturally in proportions of 96.941%, 0.647%, 0.135%,…

Q: An unknown element X has the following isotopes: ¹⁰X (20.00% abundant) and ¹¹X (80.00% abundant).…

A: The term isotopes can be defined as the variants of a given chemical element that differ in neutron…

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: Suppose that atomic masses were based on the assignment of a mass of 12.000 g to 1 mol of carbon,…

A: SOLUTION: Step 1: One Dalton is defined as one-twelfth the mass of one mole of carbon-12 isotopes.…

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: An unknown element X has the following isotopes: 140X (89.00% abundant) and 142X(11.00% abundant).…

A: Since,         Average Atomic mass=Σass of Isotope×% of Isotope100

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: Natural carbon, which has an atomic weight of 12.011 amu, consists of carbon-12 and carbon-13…

A: Average mass of an element is defined as the atomic mass of the element calculated by multiplying…

Q: Which elements make up about 99% of the mass of living things?

A: Elements are very important for the maintenance of biological life. For example sodium and potassium…

Q: An unknown element X has the following isotopes: 25X (80.5% abundant) and 27X (19.5% abundant). What…

A: Given, The natural abundance of isotope I, 25X = 80.5 % The natural abundance of isotope II, 27X =…

Q: "Lithium has two isotopes. Lithium-6 has an actual mass of 6.015 g/mol and lithium-7 has a mass of…

A: Given: There are two naturally occurring isotopes of lithium. Molar mass of isotope 1 i.e. lithium-6…

Q: a. 0 35. Rubidium has two naturally occurring isotopes, Rb-85 (relative mass 84.9118 amu) with %…

A:

Q: The natural abundance for element "X's" isotopes are: 19.9% 10X (10.013 amu) and 80.1% 11X…

A: Given, an element X and has two natural isotopes with abundance of19.9% of X10(10.013 amu) and 80.1%…

Q: Natural gallium, which has an atomic weight of 69.7230 amu, consists of gallium-69 and gallium-71…

A:

Q: The atomic masses of the two stable isotopes of boron, boron-10 (19.78 percent) and boron-11 (80.22…

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

Q: What is the mass in amu of a carbon-12 atom?  Why is the atomic weight of carbon reported as 12.011…

A: The mass in amu of a carbon-12 atom is 12amu.

Q: A single atom of element Q has a mass of 1.09 x 10 -22 g. What is the name of the element Q?

A: Given : Mass of single atom of element = 1.09 X 10-22 g Assuming atomic mass of element is M.

Q: An unknown element X has the following isotopes: 52X (90.00% abundant), ®X (8.00% abundant), 5°X…

A: Average atomic mass :-         Many naturally occurring elements exist in more than one isomer. It…

Q: The newly-discovered "element ~X" has 3 stable isotopes, each with the listed mass and abundance.…

A:

Q: Question attached

A: Atomic mass: It defined as the mass of the atom that is present in an element expressed in terms of…

Q: An unknown element X has the following isotopes: 5X (72.5% abundant) and 67X. What is the average…

A:

Q: An element has two naturally occurring isotopes the first isotope has an abundance of 30.37% and a…

A: With data's given Initially we are finding percentage abundance of another(second) isotope and then…

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

A:

Q: Bromine has two naturally occurring isotopes. One of them, bromine-79, has a mass of 78.918 amu and…

A: Given: There are two naturally occurring isotopes of bromine. Mass of isotope 1 i.e. bromine 79 =…

Q: Chlorine has two isotopes, 35Cl and 37Cl; 75.77% of chlorine is 35Cl, and 24.23% is 37Cl. The atomic…

A: To calculate the average atomic mass from isotopes with different percentages of availability, we…

Q: mass

A: This question is related to atomic mass.

Q: Phosphorus-31 forms an ion expressed as 31P3-.  What is the required change in the number of…

A: Concept introduction: Atom is smallest indivisible particles. Atom has subatomic particles,…

Q: What are the symbol and name for an element whose average atoms have a mass that is 38.8% of the…

A: mass of an average Chromium atom =51.9961 u Now we have to calculate 38.8% of the mass of an average…

Q: An unknown element X has the following isotopes: $2X (84.50% abundant), 49X (8.00% abundant), 5°X…

A: Given element has three isotopes Isotope - 1 : 52X Mass number (A1) = 52 Percentage abundance (X1) =…

Q: Naturally occurring lithium is a mixture of 92.58% Li@7 with a mass of 7.016 amu and 7.42% Li@6 with…

A: Given - Sufficiency  of  Li-7  = 92.58% isotope  with mass =7.016 amu sufficiency  of  Li-6  isotope…

Q: Chlorine has two naturally occurring isotopes, ³⁵Cl (isotopicmass 34.9689 amu) and ³⁷Cl (isotopic…

A: Percent abundance tells about the abundance of each isotope in the atmosphere.

Q: A fictitious element only has two naturally occurring isotopes: X and Y. If isotope X has a mass of…

A:

Q: An unknown element X has the following isotopes: ⁵⁸X (68.00% abundant), ⁶⁰X (26.00% abundant), ⁶²X…

A:

Q: An unknown element is a mixture of isotopes 151X and 153X. The average atomic mass of X is 151.69…

A:

Q: . Titanium has five common isotopes: "Ti (8.00%, 45,983 amu), 47TI (7.80%, 46.988 amu), 11 S.4%,…

A: Note: If you do not mention the questions that need to be solved, the answer provider will…

Q: An unknown element X has the following isotopes: ²⁵X (80.5% abundant) and ²⁷X (19.5% abundant). What…

A: Average atomic mass of X can be calculated as  Average atomic mass of X = ( Atomic mass of ²⁵X * %…

Q: An unknown element X has the following isotopes: 12°X (22.00% abundant), 128X (34.00% abundant),…

A: Given that element = X, With three isotopes. X-126, X-128 and X-130. The percentage abundance are:…

Q: Natural rubidium has the average mass of 85.4678 u and is composed of isotopes85 Rb (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: A new synthetic element is found to have two isotopes. One isotope has an abundance of 68.2% and a…

A: Given: Abundance of 1st isotope = 68.2% Abundance of 2nd isotope = 31.8 % Atomic mass unit of 1st…

Q: An unknown element X has the following isotope: 25X (80.5% abundant) and 27X (19.5% abundant). What…

A: Given : Isotope 1 : X25            Atomic Mass = 25           % Abundance = 80.5 %…

Q: The element silver (Ag) has two naturally occurring isotopes:109 Ag and 107Ag with a mass of 106.905…

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.