An essay written by carbon pencil on a paper weighs 0.5 mg. How many carbon atoms present in the essay?

Q: 8. How many oxygen atoms are contained in 5.25 g of NO2 gas?

A:

Q: A container has 5.80 x 1023 molecules (aka atoms) of bromine gas. Calculate the mass (in g) of…

A: Bromine gas = Br2 Molar mass of Diatomic  Br2 gas = 159.808 g/mol 6.022 x 1023 molecules mass =…

Q: How many hydrogen atoms do 27.0 g of H2O contain?

A: In every molecule or substance for one mole of it, there will be 6.022×1023 units of it. This is the…

Q: i. How many atoms of oxygen are in 8.1 g CO,? j. How many atoms of hydrogen are in 5.0 g NH3?

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Q: The density of Bi at 25 °C is 9.808 g>cm3. How many Bi atoms are present in a cube of the element…

A:

Q: he amounts of gold (Au) in the crowns of three members of the royal family of King Midas are shown…

A: 1mole of a substance contains Avogadros's number of atoms( 6.022×1023).

Q: Mg(s) + 2 HCl(aq) −−−→ MgCl2aq) + H2(g)   given that the mass of magnesium is 0.030 g, find the…

A:

Q: A block of pure magnesium metal weighs 76.9 grams. How many moles of magnesium are present in the…

A: Mole= mass of Mg / molar mass of Mg Given - 1) mass of Mg =76.9              2) Molar mass of Mg=…

Q: 13 4 10 5.50 g of a certain Compound X, known to be made of carbon, hydrogen and perhaps oxygen, and…

A: Here an organic compound of mass 5.5 gram containing carbon and hydrogen , perhaps containing…

Q: 12. If that hamburger contains 3.1 x 10 moles (or 0.000 000 31 moles) of selenium, how many grams of…

A: Given, Moles of selenium = 3.1 × 10-7 moles Note: Atomic mass of selenium = 78.96 g/mol Mass (in…

Q: How many moles of gold are present in a sample containing 7.50 x 1024 atoms of gold?

A: Given- Number of atoms of gold = 7.50 ×1024 atom

Q: The figure (Figure 1) shows the reaction of element A (lavender spheres) with element B (tan…

A:

Q: What is the mass, in g, of 1.00 mol of nitrogen atoms?

A: Molar mass of the Nitrogen gas (N2) = 28 g/mol 1 mole = 6.022×1023 moles

Q: 6Li + N2 --> 2Li3N If 50 g Li reacts with 40 g N2, what is the maximum mass of lithium nitride…

A:

Q: 1.50 g of a certain Compound X, known to be made of carbon, hydrogen and perhaps oxygen, and to have…

A: Given: Mass of compound X = 1.50 g Molecular mass of compound X = 70 g/mol Mass of carbon dioxide =…

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

A:

Q: A certain organic compound has the formula C9H11O2.  A sample of this compound weighs 85.88 grams.…

A: The formula of the given organic compound is C9H11O2.  Mass of the compound=85.88 grams. The molar…

Q: the atomic weight of magnesium is 24.3 g/mol, calculate how many magnesium atoms does 5g represent?

A: Mass of Mg = 5 g Atomic weight of Mg = 24.3 g/mol

Q: 4.00 g of a certain Compound X, known to be made of carbon, hydrogen and perhaps oxygen, and to have…

A:

Q: If 2.06 mL of seawater contains about 6.91×10-14 moles of gold, how many atoms of gold are in that…

A:

Q: If a sample of ammonium sulfate weighs 4.23 g. How many ammonium ions are in that sample?

A: 1 mole = 6.022×1023 [Avogadro's number]  Molar mass :-  The mass of one mole of molecules of a…

Q: A sample of Mg(NO3)2 has a mass of 71.5 grams. how many atoms are in this sample? (molar mass is…

A: Mg(NO3)2 has a mass of 71.5 grams.  Molar mass of Mg(NO3)2 = 148.3 g/mol Formula used: Number of…

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

A: Given that, Molar mass of nicotine C10H14Nx is                162 g mol-1.  Value of x = ?

Q: A diamond contains 5.0x1021 atoms of carbon. What amount(moles) of carbon and what mass(grams) of…

A: No. of atoms of 'C' = 5.0×1021 atoms Calculation of no. of mol of 'C': n=No. of atoms6.022×1023…

Q: 1 mol 197.0 g 1. X 4 = 1 mol 6.022 x1023

A: 1. mole : 1 mole of any substance contains avogadro number (NA) of substances     i.e 1 mol =…

Q: 4. A 1.628-g sample of a hydrate of magnesium iodide is heated until its mass is reduced to 1.072 g…

A: Answer :- MgI2.8H2O The formula of given Hydrated Magnesium iodide = MgI2.8H2O…

Q: How many grams of C are present in 4.84 grams of carbon dioxide ?

A: We have to find grams of C are present in 4.84 grams of carbon dioxide

Q: Convert between moles and numbers of atoms. A sample of lithium contains 2.24x1025 Li atoms. What…

A:

Q: 3.50 g of a certain Compound X, known to be made of carbon, hydrogen and perhaps oxygen, and to have…

A:

Q: Suppose you have a sample of sodium weighing 11.74 g. How many atoms of sodium are present in the…

A: The number of moles (n) of sodium present in the given sample is calculated from the expression (1).…

Q: A sample of calcium nitrate crystal hydrate with its mass of 1.1808 g was heated at 150oC resulting…

A:

Q: Molar mass is defined as: a. the mass of one mole of a substance in grams. b. the mass of one gram…

A: option a

Q: How many atoms are present in 0.430 g of gold?

A: Given, mass of Gold = 0.430 g  Molar mass of Gold = 196.97 g/mol Number of Atoms = ?

Q: How many oxygen atoms are in 1.70 g of quartz?

A: The chemical formula of quartz is SiO2. The formula mass of SiO2 is 60.08 g. The number of moles (n)…

Q: How many lithium atoms are contained in 5.5 moles of lithium? The molar mass of lithium is 6.941…

A: Since number of atoms = moles X Avogadro's number And Avogadro's number = 6.022 X 1023  Moles given…

Q: 20)A 10 g sample of which substance contains the greatest number of hydrogen Atoms? 

A: [A.] 10 g of PH3  Molar mass of PH3 = 33.997 g/mol  Number of moles of PH3 = 10 g / 33.997 g/mol  =…

Q: 1. What mass of potassium chlorate would be needed to form 56.8 g of oxygen? 2KCIO3 ----> 2KCI + 3…

A: Please note- As per our company guidelines we are supposed to answer only one question. Kindly…

Q: A sample of phosphorus weighs 3.8 x 103 ng.  How many phosphorus atoms are present in this sampme?…

A:

Q: How many atoms are in 20.5 g of carbon-12?

A: We know that, 1 Mole = 6.023 X 10^23 Atoms / Molecules /Ions Number of moles = Given mass / Molar…

Q: Suppose 2.43 g of magnesium is reacted with 3.20 g of oxygen: 2Mg + O2 → 2MgO. How many grams of MgO…

A:

Q: Alex’s mass before getting the tattoo was 61.5 kg.  The tattoo contains 5.20x1023 molecules of iron…

A: Given, Alex’s mass before the tattoo = 61.5 kg  tattoo contains 5.20x1023 molecules of Fe3O4

Q: chalcone 208.3 g/mol

A: A) mass of acetophenone = ( 1.20mL ) • ( 1.03 gmL-1 ) = 1.236g  B) mass of Benzeldehyde = ( 1.40mL )…

Q: 1. An essay written by carbon pencil on a paper weighs 0.5 mg. How many carbon atoms present in the…

A:

Q: 8.00 g of a certain Compound X, known to be made of carbon, hydrogen and perhaps oxygen, and to have…

A: Given :  Mass of compound = 8.00 g  Molar mass of X = 138. g/mol  Mass of CO2 formed = 17.86 g  Mass…

Q: The mass in grams of iodine in a sample of BaI 2 that contains 15.7 grams of barium is

A: The moles of Barium ion is calculated as follows,

Q: 19 How many nitrogen atoms are present in 25.00 g of N,O,?

A:

Q: A 52-kg woman has 7.2 x 10 mol of hemoglobin (molar mass = 64456 g/mol ) in her blood. How many…

A: We know that 1 mole of any substance contains Avogadro number of molecules i.e 6.022 ×1023…

Q: A certain organic compound has the formula C9H11O3. A sample of this compound weighs 3.4 grams.…

A: The formula of the organic compound is C9H11O3. The molecular mass of the organic compound=9 x 12 +…

Q: How many P atoms are present and what is their combined mass per mole of Ca3(PO4)2? Mass Ca = 120.24…

A: Given: Mass of Ca= 120.24 g Standard data: The molar mass of Ca3(PO4)2 =310.18 g/mol The molar…

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.