A new element is discovered and has three stable isotopes. The atomic weight of the element is 269.7374 amu. Isotope X-268 has a measured mass of 267.9086 amu and an abundance of exactly 0.2 (infinite sig figs) Isotope X-272 has a measured mass of 271.8937 amu and an abundance of exactly 0.45 (infinite sig figs)   What is the mass (in amu) of the other isotope?   Report to the ten thousands place (4 decimal places)

Q: An unknown element is a mixture of isotopes ¹²⁹X and ¹³²X. The average atomic mass of X is 130.79…

A: The isotope of the unknown element is given as 129X and 132X.  The average atomic mass of X is given…

Q: The two naturally occurring isotopes of element X are ^18X (80%) and ^19X. What is the average…

A: Average atomic mass: The average atomic mass of an element is the sum of the masses of its isotopes,…

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

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Q: 2. Silver has an average atomic mass of 107.87 amu and has 2 isotopes. *Ag has a mass of 106.95 amu…

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Q: Tungsten has 5 naturally occurring isotopes. These are: Isotope Isotopic mass % Isotopic…

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Q: Silicon has three naturally occurring isotopes (Si-28, Si-29, and Si-30). Masses and natural…

A: From the values given in the table we will first calculate the abundance if Si-30 as shown in the…

Q: There are two naturally occurring isotopes of rubidium. What is the abundance of each isotope?…

A: The abundance of each isotope is to be calculated.

Q: Antimony has two naturally occuring isotopes, Sb121Sb121 and Sb123Sb123. Sb121Sb121 has an atomic…

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Q: If an element, El, has two isotopes with the masses and abundances listed below: 72El: 72.1961 amu;…

A: The element that possesses distinct number for neutrons (might be less or more) as compared to its…

Q: (b) A certain element has two naturally occurring isotopes. The mass of one of the isotopes is…

A: The meaning of iso is the same and topes stands for the position. In the periodic table, if the…

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: An element has four naturally occurring isotopes. The mass and fractional abundance of each isotope…

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Q: A compound is composed of phosphorus and hydrogen. The mass ratio is 10.2 g of phosphorus to 1.00 g…

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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: Tur Enter numeric value al used in the filaments of incandescent light bulbs. Naturally occurring…

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Q: Cesium has 39 known isotopes ranging from mass 112 to 151. If a sample of cesium containing only…

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

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

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Q: 1. Use the following table of data to calculate the average atomic mass of an unknown element, X:…

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Q: Consider the element Ti (p=22, n=26) with a nuclear mass of 7.94869 x 10-23 g. (Given: mass of…

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Q: 1. Lithium occurs in nature as a mixture of two isotopes: Li, which has an atomic mass of 6.015 amu,…

A: Given;

Q: bottle. The bottle contains 3.78 L of ethanol. The bottle contains 2 What is the density of ethanol…

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Q: A completely made up element called Krystogen has two naturally occurring isotopes. The atomic…

A: Weight average of any element can be obtained by adding the product of mass of each isotope and its…

Q: Magnesium exists in nature as three stable isotopes. Suppose you determine that 9.87 moles of…

A: Given - Exact masses of isotopes of Mg 25Mg = 24.9858 amu 24Mg= 23.9850 amu. 26Mg = 25.9826 amu. To…

Q: An unknown element X has the following isotopes: 1ºX (20.00% abundant, atomic mass = atomic mass =…

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Q: Please answer in full

A: Let the number of atoms be x of 179u Isotope, then number of atoms of 180u isotope will be 220 -(11+…

Q: An unknown element X has the following isotopes: ²⁵X (80.50% abundant, mass = 25.03 amu) and ²⁷X…

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Q: A newly discovered element, X, has 3 isotopes weighing 350 amu, 355 amu, and 357 amu. If the…

A: Given:3 isotopes of X weighs 350 amu, 355 amu, and 357 amuAbundances of these isotopes are 50.0 %,…

Q: isotope 12 C 13 C mass (amu) 12.000 13.003 natural abundance п% %*

A: Natural abundance: The relative amount of the isotopes of an element as it occurs in nature.Isotopes…

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

A: Given :  element X has the isotopes: ²⁵X (80.5% abundant) and ²⁷X (19.5% abundant).  Since Atomic…

Q: 6) Copper used in electric wires comes in two flavors (isotopes): "Cu and "Cu. "Cu has an atomic…

A: Average atomic mass of an atom can be calculated asAAM=100ma​×abundancea​+mb​×abundanceb​+....​ We…

Q: A made up element ey has three natural isotopes. The isotopes each have an atomic mass of 33.02…

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Q: 7) Magnesium consists of three naturally occurring isotopes. The percent abundance of these isotopes…

A: Step 1:Atomic mass of magnesium -24 is 23.80428 amu  Step 2: Step 3: Step 4:

Q: Calculate the mass in grams of each of the following and provide the answer in scientific notation…

A: To solve this problem we will use the formula  1 mol of any substance = 6.022 × 1023 atoms

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: Element Kittypurrium (named after one of TA's cats) has two isotopes: Isotope 1 has an atomic…

A: Percent of isotop 1 = 91.162%   Atomic weight of isotop 1 = 40.005 g/mol  Percent of isotop 2 =…

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: 19,9924 AMU is the mass of one of the three isotopes of neon equaling 90.4838%. One of the other two…

A: Here, the three isotopes of Neon is

Q: Gallium consists of two isotopes, gallium-69 and gallium-71. Gallium-69 has a mass of 68.926 u and a…

A: Fractional abundance is the abundance shown in the fraction. It is the proportion of various isotope…

Q: Antimony has two naturally occuring isotopes, Sb121 and Sb123. Sb121 has an atomic mass of 120.9038…

A: Given: Weight of isotope Sb121 = 120.9038 u Weight of Isotope Sb 123 = 122.9042 u. Average atomic…

Q: Iron exists in nature as a mixture of predominantly three isotopes: 54 Fe (53.94 amu), 56 Fe (55.93…

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Q: Copper has two naturally occurring isotopes with atomic masses of 62.9296 u (C u) and 64.9278 u…

A: When two atoms have same atomic number and different atomic mass, such atoms are called isotopes.…

Q: Incomplete Chlorine has two naturally stable isotopes: 35 CI (34.968853 amu) and 37 CI (36.965903…

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Q: A fictitious element X has two isotopes with the following masses and % abundances. What is the…

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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.