One compound of elements X and Y contains 35.2% X (by mass); another compound contains 24.6% X. b) If molecules of the first compound contain three atoms of Y per atom of X, how many atoms of Y per atom of X are there in molecules of the second compound?

Q: A sample of an unknown compound with a mass of 0.847 g has the following composition: 50.51 %…

A: Given, Mass of the compound = 0.847 g Percent mass of fluorine in the compound = 50.51 % Percent…

Q: Does the percent by mass of each element in a compound depend on the amount of that element used to…

A: The mass percent is calculated by the formula, % mass of element=mass of element in compoundmass of…

Q: 200 words, explain of what are atoms composed?

A:

Q: A.How many moles of boron trichloride are present in 1.03 x 10^23 molecules of this compound? B.How…

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

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: On earth, tin has 10 different stable isotopes. The heaviest, 124Sn makes up 5.80% of naturally…

A: Grams of 124Sn present in 38.3 g sample     = 38.3*(5.80/100)= 2.22 g

Q: element b forms a chloride BCl3 containing 46.62% chlorine by mass. what is the identity of this…

A: Consider the molecular mass of the compound BCl3 which is formed by the combination of an unknown…

Q: What kind of chemical formula can be obtained from experimental data showing the relative masses of…

A: The formula obtained is:

Q: How many atoms of carbon are combined with 7.70 moles of hydrogen atoms in a sample of the compound…

A: C2H6 From this Molecule we get that ; 1 mol C2H6 contain ; 2 mol Carbon and 6 mol Hydrogen    We can…

Q: Please solve a, b, c thank you

A: Lead(IV) selenite is Pb(SeO3)2  Molar mass of compound = 461.2 gm/mol  Mass of compound = 12.47 gm

Q: The organophosphate nerve agent A-234 is believed to have the formula C5H8F2NO3P. It is one of the…

A: Molecular formula: C5H8F2NO3P Isotope of organophosphate nerve agent with molecular formula…

Q: How many Atoms are there in C6H12O6 ?

A: Atoms are the basic building blocks of all matter. They can combine to form molecules, whose…

Q: How many Atoms are there in 6CO2

A: We know that atoms are the smallest unit of matter.

Q: The atomic weight of bromine is 79.904, yet no atom of bromine weighs 79.904 amu. Why is this true?

A: Given : The atomic weight of bromine is 79.904, yet no atom of bromine weighs 79.904 amu.

Q: Consider two salt samples, 10.0 grams of Li2SO4 and an equal mass, 10.0 g, of Na2S2O3. Atomic…

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Q: How many atoms of hydrogen are found in 8.12 mol of ethane, C2H6?

A: Given -> Moles of ethane = 8.12 mole

Q: Which of these statements is FALSE about the mole? O a. 1 mole is equal to 6.022 x 10 23…

A: Since you gave posted multiple questions, we are entitled to answer the first only.

Q: A sample of Fe(H2PO4)3 that contains 12 000 oxygen atoms must also contain how many phosphorus…

A: Given Number of oxygen atoms = 12000 To find number of phosphorus atoms

Q: There are two different isotopes of bromine atoms. Undernormal conditions, elemental bromine…

A: Hello. Since the question contain multiple sub-parts, the first three sub parts are solved. In case…

Q: How many moles of Sn are there in a sample of Sn that contains 2.38x10^24 atoms

A: Number of moles = Given no. of atoms/NA NA = Avogadro's number = 6.022 x 1023 Number of Sn atoms  =…

Q: How many atoms of carbon are combined with 6.89 moles of hydrogen atoms in a sample of the compound…

A: In ethane C2H6 , 2 moles of carbon are combined with 6 moles of hydrogen.

Q: A typical silicon chip has a mass of 2.3 x 10-4 g. Assuming the chip is pure silicon, how many…

A: Given that the mass of silicon chip is 2.3×10-4 g. The number of moles can be calculated using the…

Q: The chemical formula for glucose is: C,H1206 How many carbon atoms are in each molecule of glucose?

A: The formula of glucose is given as C6H12O6.

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: A.How many moles of boron tribromide are present in 5.93 x 10^22 molecules of this compound?…

A: The molar mass of bromine tribromide  (BBr3) is 250.52 g/mol .

Q: How many atoms are in 28.0 grams of magnesium?

A:

Q: Vitamin A has the molecular formula C20H300. How many carbon atoms are in 6.02 x 1023 molecules vit…

A: As molecular formula of vitamin A is C20H30O . Thus in one vitamin A molecule  has 20 carbon atoms .…

Q: A sample of Fe weighs 82.9 grams. Will a sample of Ba that contains the same number of atoms weigh…

A:

Q: 2. Law of Definite Proportion. When 60.0 g of carbon is burned in 160.0 g of oxygen, 220.0 g of…

A:

Q: How many grams of Zn are there in a sample of Zn that contains 4.33x1023 atoms? grams

A: Using molar mass of Zn, grams of Zn present in a sample of Zn can be calculated.

Q: A compound is 32.88% C, 4.14% H, 19.18% N and 43.80% O by mass, and it has a molar mass of 219…

A:

Q: How many fluorine atoms are present in 117.99 g of sulfur hexafluoride? O a. 4.865 1024 fluorine…

A: The molecular formula of sulfur hexafluoride is SF6. The mass of sulfur hexafluoride is = 117.99 g…

Q: A.How many grams of calcium carbonate,CaCO3,are present in 2.06 moles of this compound? B.How many…

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

Q: A sample of Ni weighs 73.6 grams. Will a sample of Ag that contains the same number of atoms weigh…

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: atoms

A: it is made of 3 tiny partical  known as electron ,proton and neutron  Neutron  and proton make…

Q: What mass of cerussite (PbCO3), would contain 35.0 grams of lead?

A:

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

A:

Q: an oxide of iron has the formula Fe3O4. what mass percent of iron does it contain?

A: Molar mass of Fe = 55.845 g/mol.Molar mass of O = 15.999 g/mol.

Q: Common brass is a copper and zinc alloy containing 37.0% zinc by mass and having a density of 8.48…

A:

Q: A binary compound of oxygen and an unknown element, X, has the formula X20 and is 53.55 mass %…

A: Ionic or covalent : An ionic bond is formed from one atom to another atom and forms attaches through…

Q: How many of the indicated atoms are represented by eachchemical formula: (a) carbon atoms in…

A: The number of indicated atoms present in each chemical formula are:

Q: How many atoms are present in a Mg sample with a mass of 10.6 grams?

A: Given, mass of Mg sample = 10.6 g Number of atoms present in 10.6 g of Mg sample = ? Note: molar…

Q: A sample of Si weighs 54.8 grams. Will a sample of Ba that contains the same number of atoms weigh…

A: Answer: Since, 1 mole is always equal to 6.022×1023, therefore same number of atoms will always be…

Q: 2. How many moles would there be in 500 atoms of Silver? - 3. What is the mass of exactly 230 Sodium…

A:

Q: Rubbing alcohol often contains propanol, C3H;OH(€). Suppose that you have an 85.9 g sample of…

A:

Q: A.How many moles of boron tribromide,BBr3,are present in 3.15 grams of this compound? B.How many…

A:

Q: Aspartame, C14H18N205(s), is used as an artificial sweetener in low calorie foods. Arrange the…

A:

Q: How many of the indicated atoms are represented by eachchemical formula: (a) carbon atoms in…

A: The number of indicated atoms present in each chemical formula are:

Q: How many atoms are in one molecule of Na2SO4? How many different elements are in the compound…

A: The compound Na2SO4 contains two sodium atoms, one sulfur atom and four oxygen atoms in its chemical…

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.