Natural rubidium has the average mass of 85.4678 u and is composed of isotopes85Rb (mass = 84.9117 u) and 87Rb. The ratio of atoms 85Rb/ 87Rb in natural rubidium is 2.591.Calculate the mass of 87Rb.

Q: An Organic compound contains 59.00% by mass C, 7.15% by mass H, 7.65% by mass N, and 26.20% by mass…

A: Given data is as follows: The elements are given in percent which is out of 100. So, the mass of C =…

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: The density of solid Fe is 7.87 g/cm³. How many atoms are present per cubic centimeter (cm³) of Fe?

A: a)  Density of Fe = 7.87 g/cm3  1 mol Fe = 56.0 g/mol  1 mol Fe = 6.023 × 1023 Fe atoms    The…

Q: What is the mass, in grams, of 8.55x1021 iron atoms? O 11.9g O 0.793 g O 1.26g 55.7g

A: Given: Number of iron atoms = 8.55 × 1021 atoms.

Q: the number of copper atoms in a 3.0g lump of copper is 2.8x1022 .how many electrons present in the…

A: Number of copper atoms = 2.8 × 1022  We need to determine number of electrons present.

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: 250 g of an alloy contains 52 wt% tin (Sn) and 48 wt% lead (Pb). The atomic weight of Sn is 118.7…

A: It is defined as amount of solute ( in grams) present in 100 g of solution is called " mass…

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

A:

Q: In what mass units are the average atomic mass and molecular mass expressed? What is the value of…

A: The average atomic mass and molecular mass is expressed in atomic mass unit (amu). It is defined as…

Q: When iron comes into contact with oxygen in the presence of water, it undergoes a chemical reaction,…

A:

Q: A materials engineer has filed for a patent for a new alloy to be used in golf club heads. The…

A: The minimum composition of elements is as follows: Mn=25%Al=6.3%C=0.65%Cr=5.5% The maximum…

Q: Would it be possible to determine the percentage of oxygen in NaCIO3?

A: The given compound is = NaCIO3 The percent of oxygen in this compound is =?

Q: Manganese is a transition element essential for the growth of bones. What is the mass in grams of…

A: 1 mol  = 6.022 × 1023 atoms 1 atom   =   1 / 6.022 × 1023 atoms   Mass in grams = Moles × Molar mass…

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

A: After the decomposition of sodium fluoride, the mass of fluorine produced is calculated by using the…

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: The density of solid Cr is 7.15 g/cm3. How many atoms are present per cubic centemeter of Cr?

A: Mass = Volume x density Number of moles = Mass/molar mass Number of molecules = 6.0224 x 1023 x…

Q: When barium (Ba) reacts with sulfur (S) to form barium sulfide (BaS), each Ba atom reacts with an S…

A: Calculate the amount of S. Mass of the sulfur=Volume (density) Mass of the sulfur=1.75 cm3(2.07…

Q: On a periodic chart of the elements, molar mass (M), also called atomic weight, is often listed as…

A: A chemical compound consists of two or more different elements which are bonded with each other…

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

A:

Q: A binary compound between an unknown element E and hydrogen contains 91.27% E and 8.73% H by mass.…

A: The formula of the binary compound is E3H8.

Q: Calculate the mass, in grams, of 532.0 atoms of cadmium, Cd (1 mol of Cd has a mass of 112.41 g).

A: We know that, 1.0 mol of any substance = 6.022 × 1023 atoms of that substance.

Q: What is the mass in grams of 6.022 * 1023 N atoms of mass 14.01 amu?

A: To determine the mass in grams of 6.022x1023 N atoms of mass 14.01 amu Given that: Mass of each atom…

Q: 2. In a chemical atomic mass determination, the tin content of 3.7692 g of SnCl4 was found to be…

A: In SnCl4 one Sn atom combine with 4 chlorine atom. Given mass of SnCl4 is 3.7692 g and mass of Sn is…

Q: A sample of a “suboxide” of cesium gives up 1.6907% of its mass as gaseous oxygen when gently…

A:

Q: Question attached

A: Number of moles of the substance is equal to the ratio of mass to the molar mass of the substance.…

Q: Calculate the mass, in grams, of 422 atoms of potassium, K (1 mol of K has a mass of 39.10 g).

A: Atoms of potassium = 422 atoms  Mass of 1 mol potassium = 39.10 g Mass of 422 atoms of K = ?

Q: Matter is neither created nor destroyed in a chemical reaction. Thus, the mass of the products of a…

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Q: When a chemical reaction occurs, atoms rearrange to form new compounds, but no new atoms are created…

A: Figure shows A is single element. There are 4 A atoms present in the reactant side. B is diatomic…

Q: In using a mass spectrometer, a chemist sees a peak at a mass of 30.0106 AMU. Of the choices 12C2…

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Q: A brass alloy contains 78.6% copper, Cu, by mass with the remainder of the alloy being zinc, Zn.…

A:

Q: How many gold (Au) atoms are there in a 10. g sample of that is 50% Au by mass?  a. 6.2 x 1022 b.…

A:

Q: How many copper atoms are present in a 2017 penny with mass 3.10 g? Modern pennies are 97.5% Zn and…

A: we have a penny of mass 3.10 gram. and it's also mentioned that in  a modern penny the percentage of…

Q: The average atomic mass of carbon is 12.011 amu. Assuming you were able to pick up only one carbon…

A: Given that, the average mass of carbon is 12.011 a.m.u. The given mass of any of the carbon isotopes…

Q: The molar mass of platinum is 195.08 g/mol. What is the mass of 1.00 × 102 Pt atoms?

A: Given information: Molar mass of Pt = 195.08 g/mol Atoms of platinum = 1.00 × 102

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: Amounts of tin may be alloyed with copper to produce bronzes of varying composition and properties.…

A: Given :  Mass of bronze = 8.9394 g  Mass of mixture of oxides = 11.2311 g

Q: 2. The volume of the nucleus of a carbon atom is about 9.9 x 10-39 mL. The molar mass of carbon…

A: Given: Volume of carbon nucleus atom = 9.9 × 10-39 mL. And molar mass of a carbon atom = 12.00…

Q: *(ii) The reaction of ethene with aqueous potassium manganate(VI), KMNO, produces ethane-1,2-diol,…

A: Mass spectrum is used for the separation of ions and fragmentation of ions takes place in the…

Q: Mass spectrometry is more often applied to moleculesthan to atoms. We will see in Chapter 3 that the…

A: When we study the interaction of electromagnetic radiation with matter then this study is known as…

Q: A macromolecule has an empirical formula of C4H306. The molecular mass for the macromolecule is…

A: Given :- empirical formula of macromolecule = C4H3O6  Molecular mass of macromolecule = 429.21 g/mol…

Q: 3.97 x 10^24 molecules of NO has what mass

A:

Q: 9.00 g of a certain Compound X, known to be made of carbon, hydrogen and perhaps oxygen, and to have…

A: According to the question, we need to find out the molecular formula of the hydrocarbon X.  We have:…

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: How many moles of lithium are there in 1.204 X 1024 lithium atoms?

A: How many moles of lithium are there in 1.204x1023lithium atoms ?

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: Boron trifluoride is used as a catalyst in the synthesis of or-ganic compounds. When this compound…

A: When the compound involves boron-11 and fluorine-19 isotope, the molecular mass of the compound is;…

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

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

A:

Q: 9. Explain how the atomic mass unit (amu) is defined and explain how the definition of an amu, in…

A: amu i.e atomic mass unit is the unit used to express mass .  Avogadro's number = 6.0221 × 1023

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.