Rubidium has two naturally occurring isotopes: 85 Rb (atomic mass = 84. 9118 AMU)and 87 Rb (atomic mass = 86. 9092 AMU). The percent abundance of 87Rb can be estimated to be which of the following? (a) 0% (b) 25% (c) 50% (d) 75%

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: (a) In the certain hydrated salt MSO3-4H20, the mass percentage of H2O is 44.71%. Identify the…

A:

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: 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: the atomic masses of 10B and 11 B are 10.012938 and 11.009305 amu, respectfully. The average atomic…

A:

Q: In which of these compounds are there twice as many Oxygen atoms as Hydrogen atoms?

A: To find :- The compound having oxygen atoms two times more than the hydrogen atoms.   We can easily…

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: Calculate the average atomlc mass of lithlum, whlch occurs as two Isotopes that RVU Mu following…

A: We need to calculate average mass from given mass and relative abundance of isotopes.

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 ratio of the mass of O to the mass of N in N20z is 12:7. An- other binary compound of nitrogen…

A: The given ratio of mass O to the mass of N in N2O3 is 12:7 Mass of O in N2O3 = 3x16 amu…

Q: What is the mass, in grams, of 2.08 × 1024 aluminum (Al) atoms?

A: The question is based on mole concept. We have to determine mass of aluminium present.

Q: Assume that Element Q has the following three isotopes: 248 Q, 252 Q, and 259 Q. If the atomic mass…

A: Average atomic weight is the sum of the masses of the individual isotopes each multiplied by its…

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: (a) In the certain hydrated salt MSO3-4H20, the mass percentage of H20 is 44.71%. Identify the…

A:

Q: Tungsten (W) and chlorine (Cl) form a series of compounds with the following compositions:Mass % W…

A: If each tungsten atom contain one atomic mass so, need to determine the number of moles of each…

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

A: The average atomic mass of any particular element which exists in two or more isotopic forms, can be…

Q: Verify that the atomic weight of lithium is 6.94, given the following information: 6 Li, mass =…

A: Given,  Percent abundance of 6Li = 7.50% Mass of 6Li = 6.015121 amu Percent abundance of 7Li =…

Q: Polyisobutylene is a synthetic elastomer, or rubber. The corresponding monomer is isobutylene, which…

A: Given, molecular formula C4H8

Q: The molar mass of nicotine C10H14NX is 162 g/mol. What is the value of x?

A:

Q: The atomic mass of fluorine is 18.998 amu, and its mass spectrum shows a large peak at this mass.…

A: The isotope of fluorine having a mass of 18.998 amu is highly abundant by a very large amount, which…

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: Rubudium have two isotopes, 85Rb has mass 84.9117 amu and 87Rb has mass 86.905 amu. If the average…

A: The naturally occurring Rubidium  has two isotopes, therefore both of them are present in Rubidium…

Q: How many atoms of hydrogen are found in 3.92 mol of hexane, C6H14?

A:

Q: What are the mass percent of elements in glucose, C6H1206?

A:

Q: A sample of 0.741 mol of a metal M reacts completly with excess flourine to form 57.8 g of MF2. What…

A: Chemical equation: M  +  F2  ------>  MF2 Number of moles of MF2 = number of moles of M

Q: How many grams of K2C2O4, potassium oxalate, would containe 182 grams of pure potassium?

A: The molar mass of potassium oxalate can be calculated as:

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

A: One mole of any substance consists of 6.022×1023 particles.Number of moles of any substance present…

Q: The water found on Earth is almost entirely made up of the 'H and 160 isotopes for a formula of H2O…

A: The element which contains the same number of protons and different number of neutron is known as…

Q: Calculate the molecular mass of the following substances: (a) Ibuprofen, C13H18O2 (a drug used as…

A: Introduction: Molar mass is the mass of 1 mole of a substance in a gram. It is also called molecular…

Q: A sample of 0.593 mol of a metal M reacts completely with excess fluorine to form 46.2 g of MF2.…

A: Given : Moles of metal M = 0.593moles Mass of MF2 = 46.2g

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

A:

Q: Give the number of atoms of the specified element in aformula unit of each of the following…

A:

Q: What is the % mass of oxygen in citric acid, C6H807?

A:

Q: The number of nonmetallic atoms in Al2 (SO3 )3 is?

A: The given compound is Al2(SO3)3. In periodic table right end elements are non metals and left end…

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

A:

Q: How many atoms of O there in 24.7 grams of Al(C2H3O2)3?

A: Here structure of the compound is AlC2H3O23 Molar mass of the compound = 27+32×12+1×3+2×16gmol =…

Q: Calculate the exact masses of the ions C5H8O1 and C6H12 1, both of which have a nominal mass of 84.…

A: The organic compounds can be identified by various characterisation techniques. For example, NMR,…

Q: The nonprescription pain relievers Advil and Nuprin contain ibuprofen 1C13H18O22, whose molecular…

A: Given, Molar Mass of Ibuprofen(C13H18O22) = 206.3 g/mol                                Number of…

Q: b) The mass of 205TI is about 204.9744 amu. Why then does the periodic chart have an atomic weight…

A: It is given that mass of 205 Tl = 204.9744 amu.  But this do not match with molar mass of Tl which…

Q: 2. Explain how the chemical formulas H (aa and H.O for the same thing. are interchangeable notation…

A:

Q: A hypothetical element, M, with average atomic weight of 35.75. M has three stable isotopes with the…

A:

Q: 6. How many hydrogen atoms are there in 0.75 mol of C,H10O?

A:

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

A:

Q: How many moles would 1.00 x 103 molecules of methane ( 1. CH4) represent?

A: Avogadro number (NA) 1 mole of a substance contains 6.02×1023 molecules 1 mole of O2 contains…

Q: JESTION 8 In the certain hydrated salt MSO3-4H2O, the mass percentage of H2O is 44.71%. Identify the…

A: We’ll answer the first question since the exact one wasn’t specified. Please submit a new question…

Q: A hypothetical element exists as two isotopes: I = 68.00 amu and II = 71.00 amu. If the percent…

A:

Q: Since 1983, pennies have been made with zinc and plated with copper. Prior to 1983, pennies were…

A: Since from 1793-1837 pennies were made up of pure copper therefore, if you had a penny from 1800…

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…

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.