natural rubidium has the average mass of 85.4678 AMU and is composed of isotopes Rb 85 (mass = 84.9117) and Rb 87. The ratio of Rb 85 to Rb 87 in natural Rb is 2.591. What is the mass of Rb 87 in AMU?

Q: A certain metal, M, forms two oxides, M2O and MO. If the percent by mass of M in M2O is 73.4%, what…

A: The answer is given below

Q: Suppose you have a sodium sample weighing 11.42 g. What mass of potassium would you need to have the…

A: Given, Mass of Na =11.42 g

Q: Calculate the mass, in grams, of each of the following: a. 2.4 mol of aluminum Mass %3D b. 1.60 x 10…

A: Mole concept: The number of molecules or atoms present in the one mole of the substance is equal to…

Q: How many moles are there in 2.75 x 10^24 atoms of copper?

A: we know that one mole of copper contain Avogadro's number of atoms Avogadro's number= 6.023 × 1023

Q: The mass of a silver (Ag) coin is 15 g. If the coin is 50% Ag by mass, then how many Ag atoms are…

A: The given mass of the silver coin = 15 g Percentage composition by mass of silver (Ag) = 50% So,…

Q: How much does 4.28 x 10 21 atoms of Nickel weigh?

A: We know that, one mole of any substance contains 6.022 × 1023 atoms. We can determine the weight by…

Q: A chemical compound containing hypothetical elements Av, Bw, Cx, Dy, Ez has mass percentages of…

A: Given: Atomic mass of Av = 18.25 g/mol. Atomic mass of Bw = 4.32 g/mol. Atomic mass of Cx = 26.82…

Q: Calculate the mass, in grams, of 992 atoms of cesium, Cs (1 mol of Cs has a mass of 132.91 g).

A:

Q: How many grams of aluminum are there in 4.05 x 10²5 molecules of Al½O3?

A: Given:- number of molecules of Al2O3 = 4.05 × 1025 molecules  To calculate :- mass of Al in grams

Q: A sample of a metal has a mass of 27.009 g. It contains 8.257 x 1022 metal atoms. What metal is it?

A: The question is based on mole concept. We have been given mass and number of atoms of metal. we have…

Q: Determine the molecular formula if the molar mass of the compound is 957.86 g/mol.

A:

Q: How many B atoms are there in 5.1 mols of B? Please give your answer in terms of scientific notation…

A: Solution The mole thought may be a convenient technique of expressing the number of a substance. Any…

Q: A chemical compound containing hypothetical elements Av, Bw, Cx, Dy, Ez has mass percentages of…

A:

Q: 3.00 x 1023 atoms

A: Mass of Ca = 20.0 g Molar mass(MM) of Ca = 40.08 g Moles of Ca = Mass/MM     = 20.0/40.08   = 0.500…

Q: If 9.05 moles of carbon monoxide is formed in the air then mass of carbon monoxide is (A) 253.49 g…

A:

Q: The mass ratio of sodium to fluorine in sodium fluoride ls 1.21:1. A sample of sodium fluoride…

A:

Q: How many grams of gold (Au; atomic mass = 197.0 g/mol) contains 2.5 x 1020 gold atoms?

A: Number of moles = mass/molar mass  Mass = moles × molar mass  Molar mass of Au = 197.0 g/mol

Q: What percentage of the mass of a phosphorus 32 atom is contributed by its electrons, given the mass…

A: Phosphorus-32 has 15 electrons. Mass of electrons in Phosphorus-32 can be calculated as follows,…

Q: D. Calculate the mass (g) of the following samples. 25) 238 moles of lead 26) 1.54 x 10° moles of Zn…

A: Since you have posted question with multiple sub-parts, we are entitled to answer the first 3 only.…

Q: A chemical compound containing hypothetical elements Av, Bw, Cx, Dy, Ez has mass percentages of…

A: We need to find molecular formula for given compound.

Q: Calculate the mass, in grams, of 852 atoms of cadmium, Cd (1 mol of Cd has a mass of 112.41 g).

A: Mole : Mole of any element is ratio of atoms of element to the Avogadro number. If number of moles…

Q: The mass of 5.20 moles of glucose, C6H12O6 is   1.56 × 10‑21 g   31.2 g…

A: Given, Moles of glucose (C6H12O6) = 5.20 mol Mass of glucose (C6H12O6) = ? Note; Molar mass of…

Q: What is the mass in kilograms (kg) of 4.29 X 1024 atoms of palladium?

A:

Q: 0.93 g sample of NaCr(SO4)2.XH20 was heated in a crucible to get a constant mass. If the mass of the…

A: In this question, we want to determine the value of x in the given Compound. How we will determine,…

Q: a certain protein has a molar mas of 2.88 x 10^5 g. what is the mass of the molecule of this protein

A: Given: Molar mass  of Protein = 2.88 x 105 g.  1 mole = 6.022 X 1023  molecules

Q: 9. How many grams are in 3.01 x 1023 atoms of carbon?

A:

Q: Given that 4NH3 + 5024NO+ 6H2O, if1.92 X 10 molecules NH were made to react with an excess of oxygen…

A: Given,  4NH3 + 5O2 ➝ 4NO + 6H2O Number of molecules of NH3 react = 1.92 × 1021 molecules Excess…

Q: A mixture of calcium oxide, Cao, and calcium carbonate, CacO 3, that had a mass of 3.454 g was…

A:

Q: 30. In calcium carbonate what is the mass percentage of  oxygen atoms?    A. 68%   B. 12%   C.…

A: Calcium atomic mass = 40. Carbon atomic mass =12. Oxygen atomoic mass = 16. Here three oxygens are…

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: The mass of a copper coin is 7.83 g. Suppose it were pure copper. a) How many moles of Cu atoms…

A: a) Given that : Mass of Copper coin = 7.83 g Molar mass of copper = 63.55 g/mol Moles of copper atom…

Q: 9. If you have 9.407 x 1023 atoms of lead, how many grams of lead (IV) phosphate can you make? 10.…

A:

Q: 27. When iron(III) oxide reacts with hydrochloric acid, iron(III) chloride and water are formed.…

A: Balanced chemical equation:  Fe2O3  + 6 HCl ---> 2 FeCl3 + 3 H2O  Mass of Fe2O3 = 10.0 g Mass of…

Q: sample of aluminum contains 2.91 × 1022 atoms of aluminum. What is the mass of this sample?  [Molar…

A: Given that: Molecules of Al = 2.91×1022 atoms  Molar mass of Al = 26.98 g/mol  1 mol = 6.023×1023…

Q: Lithium nitride reacts with water to produce ammonia and lithium hydroxide according to the equation…

A: Given,ND3 = 140 mg (or) 0.14 gMolar mass of ND3 = 20.042 g/molMolar mass of D2O = 20.027 g/mol

Q: the mass ( in g) of 1.2 x 10^24 atoms of molybdenum, Mo.

A: A mole refers to the amount of discrete entities (atoms, molecules, particles ) present in a…

Q: 45.5 grams of a magnesium reacts with 243.2 grams of oxygen gas. At the end of reaction, 211.2 grams…

A: using mole concept from Balanced chemical equation easily determination of moles of products is…

Q: O 2.4 g of carbon-1 O 1.2 g of carbon-1

A: Given The two moles of a substance:

Q: A chemical compound containing hypothetical elements Av, Bw, Cx, Dy, Ez has mass percentages of…

A: We have to determine the Molecular formula of a compound having following hypothetical elements.

Q: Calculate the mass, in grams, of 982 atoms of cesium, Cs( 1 mol of Cs has a mass of 132.91 g).

A: Concept: The mass of one mole of the atom is known as molar mass. The molar mass of cesium is 132.91…

Q: How many grams of Kr are there in a sample of Kr that contains 6.43 x 1023 atoms?

A: Mole is a unit of measurement. One mole of a substance is something that contains 6.022 x 1023…

Q: the mass of Cu (63.35 g/mol) used to create Cu2S was 41.95 grams. what theoretical mass of Cu2S…

A: The balanced reaction of Cu to form CuS is,                       2 Cu + S  ---->  Cu2S Clearly,…

Q: Al,O3 Br2 (9) AIBT, 3. If you begin the reaction with 5.62 x 1023 molecules of aluminum bromide and…

A: firstly , we will write a balanced chemical equation of above reaction.…

Q: Boron, atomic number 5, occurs naturally as two isotopes, 10B and 11B, with natural abundances of…

A: Isotopes are elements with the same number of protons but differ in the number of neutrons. The…

Q: Carbon tetrachloride was prepared by reacting 23.6 g of carbon disulfide and 47 g of chlorine gas.…

A:

Q: 1. How many moles of tungsten atoms are there in 4.8 x 1025 atoms of tungsten?

A: Since you have asked multiple question,as per our company guidelines we are supposed to answer the…

Q: Uranium (VI) fluoride (UFe) can be used for the enrichment uranium. What is the elemental…

A:

Q: Calculate the mass, in grams , of 382 atoms of cesium, Cs (1mol of Cs has a mass of 132.91 g).

A:

Q: What is the mass, in grams, of 2.84x1023 atoms of lead?

A: Given :- number if atoms of lead = 2.84 × 1023 atoms  To calculate :- mass (in g)

Q: 4. How many grams are in 1.98 x 1021 atoms of Fe?

A: We have to calculate the mass of Fe.

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.