U-238 is naturally the most abundant form of uranium; however, only U-235 can be used as fuel in a nuclear reactor, so uranium for us in the nuclear industry must be enriched in this isotope. If a sample of enriched uranium has 78.72% of U-235 isotope and 21.28% U-238 isotope, what is the average atomic mass of the Uranium sample?

Q: Purple spheres represent iodine atoms, white spheres represent hydrogen atoms, and all of the…

A: Given:  Purple atom = Iodine (I) White atom = Hydrogen (H)

Q: Should the elemental symbol for lead be written as Pb or PB? What confusion could arise if the wrong…

A: Elemental symbol for lead is Pb and it should be Pb .

Q: Matter is made up atoms, but in a real chemistry lab, we measure substances in grams. Therefore you…

A: Consider the given information about quartz is as follows; One molecule of quartz contains = 1 atom…

Q: Which if the following ionic compounds would contain the most total number of elements? (For…

A: Explanation to the correct answer is given below

Q: K: Mn: Ge: Kr:

A:

Q: Give the correct formulas for the following compounds. If you do not know how to use subscripts for…

A: A)  MP B) M3(PO4)4 C) M3(PO3)2 D) MHSO4

Q: An iron atom has a mass of 9.27x10^−23g and a cooking pot has a mass of 0.500kg. What is the mass of…

A: Given: Mass of single iron atom = 9.27 X 10-23 g And mass of cooking pot = 0.500 Kg = 500 g…

Q: the mass of OO is approximately 16 gg. What is the whole number multiple that describes the…

A: Given as, Mass of Sulphur in SO = 32 gms Mass of Oxygen in SO = 16 gms Mass of Sulphur in SO2 = 32…

Q: Suppose you are given 2.50x 104 pg of aluminum sulfate, Al(SO4)ls (s) (density = 2.672 g/cm³) a. How…

A: a) In the first problem we need to find out the number of oxygen atoms present in the given sample.…

Q: In a series of experiments, a chemist prepared three differentcompounds that contain only iodine and…

A:

Q: A.)What mass of cobalt contains the same number of atoms as 77.0 g of fluorine?

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

Q: What are the chemical symbols for antimony, arsenic, aluminum, boron, gallium, germanium, indium,…

A:

Q: Naturally occurring cobalt consists of only one isotope, 58.9332. A synthetic radioactive isotope of…

A: From given data;  Initially % of 60Co is determined and then weight of 60Co is calculated as…

Q: Which of the following samples of gases contains the greatest number of atoms? (Relative atomic…

A: 4th option is correct that is 13.0 g of C2H6

Q: Which elements have molecules as their basic units?(a) helium (b) oxygen(c) iron (d) bromine

A: The elements which have  molecules as their basic units has to be given,

Q: Which of the following gases are elements? O NH, O 0, O N,0 Rn Ar O 0, so, O H,S HCN NO NO, O He

A: Elements are the pure substances that are made up of only one kind of atoms, We are given some list…

Q: Convert 1.89 • 1024  atoms of carbon to coles of carbon

A: Given, the number of moles of carbon atoms = 1.89 x 1024 atoms 1 moles of carbon atom = 6.022 x 1023…

Q: (a) Atoms are very small compared to objects on the macroscopic scale. The radius of a aluminum atom…

A:

Q: A 37.99 gram sample of a hydrate of COCL2 was heated thoroughly in a porcelain crucible, until its…

A: Given mass of the hydrated sample of CoCl2=37.99 grams. Give mass of anhydrous sample of CoCl2…

Q: What percentage of atoms in the molecule represented in the following formula are nonmetals?…

A: % of non-metal atoms = 100 x number of non-metal atoms/total number of atoms

Q: The atomic masses of chlorine-35 (75.780%) and chlorine-37 (24.220%) are 34.969 amu and 36.966 amu,…

A: To calculate : average atomic mass of Cl

Q: An analytical chemist measures the amount of Elements E, and E, in four samples of an unknown…

A: Given is a sample of X containing E1 and E2. To find: If X is pure? To find mass of E1 if X is 10…

Q: How many carbons, hydrogens, and oxygens does ribose have in its formula?

A: Ribose sugar  aldopentose sugar  and it is present in  RNA.  Ribose moecular formula = C5H10O5

Q: Water and sodium chloride are both considered substances as well as compounds, but water exists as…

A: In this question, we have to give the reason why water and sodium chloride are both considered…

Q: What would the mass be of Gold, if you had 6.02 x 10^24 atoms of

A: GOLD, molar mass of Au = 196.97 g/mol atoms of Au = 6.023 x 1023

Q: A sample of Cs weighs 99.5 grams. Will a sample of S that contains the same number of atoms weigh…

A: 1 mole of any substance = 6.022 x 1023 atoms (Avogadro number)   No. of moles of a substance can…

Q: It is well known that the element magnesium has three naturally occurring isotopes. Mg-24 represents…

A: It is clearly indicates that the Mg-24 posses a natural abundance of 79% along with other isotopic…

Q: Iodine (I) and fluorine (F) form a series of binary compounds with the following…

A: (a)

Q: Based on the following word descriptions, write the formula for each of the indicated substances.a.…

A: A formula of any compound which represents number of the all types of atoms of that compounds…

Q: To which classes of matter—element, compound, and/ormixture—do the following apply: (a) law of mass…

A: The law of conservation of mass deals with the conservation of matter and law of definite…

Q: The seven most abundant ions in seawater make up morethan 99% by mass of the dissolved compounds.…

A: Since you have posted questions with multiple subparts, we will answer the first three subparts for…

Q: - Compare Two compounds that contain copper and chlorine have the following masses: Compound A:…

A:

Q: 4. Who discovered the neutron in 1932? A. Democritus C. Ernest Rutherford B. James Chadwick D.…

A: Mass number Mass number gives the number of protons and neutrons in an atom.

Q: When working in the lab, I take the mass of a sample of ammonium (NH3) and I find it to have a mass…

A: The mass of ammonia is = 45.74 g The mass of nitrogen is =? The mass of hydrogen is =?

Q: A one carat diamond which is made of the element carbon, weighs 0.200 grams. The average mass of a…

A: Given,1 u = 1.6605 ×10-24 g

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

A: As you already know the basics of law of mass conservation and its written over there in the…

Q: It is often possible to change a hydrate into an anhydrous compound by heating it to drive off the…

A: Given: Mass of KF hydrate i.e. KF·nH2O = 31.43 g. And the mass of anhydrous KF after heating = 19.40…

Q: A chemical formula that shows the actual # and kinds of atoms present in one molecule of a compound…

A:

Q: The total number of atoms in a molecule of caffeine (C8H10N4O2) is:

A: Given :- molecular formula of caffeine = C8H10N4O2  To calculate :-  Total number of atoms in…

Q: Which of the following ideas is NOT part of Dalton's Atomic Theory?

A: Atoms are destroyed during a chemical reaction is not part of Dalton atomic theory.

Q: Ca^2+ and S^2- as a chemical formula

A:

Q: Since 1800, almost 200 sincere but erroneous reports ofthe discovery of new chemical elements have…

A: The chemical element is a substance which cannot decompose further into simpler forms by chemical…

Q: Question attached

A: The given data contains, mass of carbon C = 0.273 g mass of oxygen O =0.727 g

Q: Two gaseous A and B are common hydrocarbons. Chemical analyses demonstrate that in one sample of A,…

A:

Q: How much money, in dollars, does one mole of nickels represent?   If this amount of money were…

A: A Nickel is a currency coin mainly used in United States of America. The value of one nickel coin is…

Q: Why would the collective mass of twenty pennies not be equal to ‘20 x’ the mass of any individual…

A:

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.