The human body contains many elements from the periodic table. It is mostly composed of oxygen and carbon, but trace elements also have a significant role. The table gives the mass, in kilograms, of some elements found in the human body, based on a 70.070.0 kg person. Atomic number Element Mass (kg) 88 oxygen 45.245.2 66 carbon 12.612.6 11 hydrogen 7.07.0 77 nitrogen 2.22.2 2020 calcium 1.31.3 1515 phosphorus 0.780.78 1919 potassium 0.250.25 1616 sulfur 0.180.18   others 0.600.60   total 70.070.0 Hydrogen makes up what fraction of the mass of the human body? Hydrogen makes up what percentage of the mass of the human body?   What is the mass of phosphorus in a 2323 kg person?

Q: Tin, element 50 on the periodic table, has 10 stable isotopes. 117^Sn makes up 7.687% of naturally…

A: Using the formula moles of Sn117 is calculated as,

Q: You are drying a sample of Ba3(PO4)2. After 5 minutes of drying it weighs 1.2034 g. You continue to…

A: Answer: Percent change in mass will be the ratio of change in mass with initial mass, therefore %…

Q: When kerosene is burned with oxygen, the products are carbon dioxide and water. If you produce 72…

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Q: A pure titanium cube has an edge length of 2.69 in . How many titanium atoms does it contain?…

A: Given- Density of titanium = 4.50 g /cm3 Edge length of pure titanium cube = 2.69 in To find- number…

Q: An aluminum atom has a mass of 4.48×10^-23 g and a small airplane has a mass of 5000. kg. Use this…

A: The objective of the question is to find out the mass of 1 mole of aluminum atoms and the number of…

Q: An analytical chemist measures the amount of Elements E₁ and E₂ in four samples of an unknown…

A: Pure substance:-  The substance in which the ratio of each element mass is constant for all randomly…

Q: Naturally occurring cobalt consists of only one isotope, 59Co , whose relative atomic mass is…

A: For the two isotopes of cobalt as 59Co and 60Co given data ;  Relative atomic mass (A1) of 59Co =…

Q: A copper atom has a mass of  ×1.0610−22g  and a penny has a mass of  2.5g . Use this information…

A: Given data :· Mass of copper atom = 1.06×10-22 g· Mass of Penny = 2.5 gWe need to calculate :· The…

Q: When a 12.259-g sample of a compound containing only copper and oxygen was decomposed it produced…

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Q: The density of gold metal is 19.3 g/cm3, while that for silver is 10.5 g/cm3. Suppose you had the…

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Q: An automobile gasoline tank holds 21 kg of gasoline. When the gasoline burns, 86 kg of oxygen is…

A: The reaction that depicts the burning of gasoline is as follows,

Q: Two elements, R and Q, combine to form two binary compounds A and B. In the compound A, 10.50 g of R…

A: The law of multiple proportions states that if two elements combine with each other to form more…

Q: A sample of sodium reacts completely with 0.142 kgkg of chlorine, forming 234 gg of sodium chloride.…

A: A)  Given :- mass of Cl2 = 0.142 kg or 142 g  Mass of NaCl formed = 234 g  To be calculated :-  Mass…

Q: The element boron has two stable isotopes: boron-10 (10.0129 u) and boron-11 (11.0093 u). The…

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Q: In the SI system of units, the mole is one of seven base units. It is frequently used in chemical…

A: yes , mole should be considered as the SI unit. The mole is the basic unit of amount of substance in…

Q: The amounts of gold (Au) in three Rings of Power are shown below. Indicate which of the rings…

A: The amounts of gold (Au) in three Rings of Power are shown below. Indicate which of the rings…

Q: A pure titanium cube has an edge length of 2.85 inin . How many titanium atoms does it contain?…

A: Edge length of pure titanium cube = 2.85 in Density  of titanium = 4.50 g/cm3

Q: The nickel is comprised of two metals, nickel and copper. Surprisingly, the coin is only 25% nickel.…

A: The coin is comprised of nickel and copper. The mass percentage of nickel in the coin is = 25% The…

Q: Two samples of calcium fluoride are decomposed into their constituent elements. The first sample…

A: The first sample produced, mass of calcium =0.154 g Mass of fluorine = 0.146 g Second sample…

Q: What is the mass of the oxygen used during the reaction? Iron + Oxygen → Iron Oxide Iron 19.43 g…

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Q: There are 1.699 x 1022 atoms in 1.000 g of chlorine.  Assume that chlorine atoms are spheres of…

A: Number of atoms in 1 g chlorine = 1.699 × 1022 atoms Number of atoms in 0.5 g chlorine = 0.5 × 1.699…

Q: Calculate the theoretical density of MgO. The atomic weights for Mg and O are 24.31 g/mol and 16.00…

A: Given data:The atomic weight of Magnesium = 24.31 g/molThe atomic weight of Oxygen =  16.00 g/molThe…

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: The chemical formula for potassium iodide is KI. A chemist measured the amount of potassium iodide…

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Q: A sample of lead contains 8.88 x 1015 micrograms. How many atoms does this sample contain?

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Q: The law of constant composition can be used to find the answer  A sample of the chemical compound…

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Q: The reaction between copper and sulfur is represented by the chemical equation shown below. What is…

A: Mole=Mass/molar mass  Then mole-mole relationship We will get the answer

Q: What is the mass in grams of 4.90 x 10^12 lead (Pb) atoms? Be sure your answer has the correct…

A: No. of atoms of Pb = 4.9 x 1012 atoms.

Q: Tia has a sample of pure gold (Au). She weighed the sample and the result was 10.810.8 grams. Tia…

A: Number of atoms = number of moles x 6.0224 x 1023 Number of moles = Mass/molar mass

Q: What is the mass, in grams, of exactly 230 sodium atoms? Would it be the same answer only in grams?…

A: Steps to convert atoms to grams • Convert atoms to moles - Divide the number of atoms with Avogadro…

Q: State the number of protons in Ag^+. Express your answer as an integer.   State the number of…

A: Electronic configuration of Ag (47) = 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s1 Number of protons…

Q: A nutrition table lists apples with a potassium content of 4600 mg/pound. Assume an average apple is…

A: According to the given data, Mass of an average apple = 75.0 g Because, 454 g = 1 poundMass of an…

Q: Crime scene investigators keep a wide variety of compounds on hand to help with identifying unknown…

A: Given: Percent mass of carbon = 67.31 %. Percent mass of hydrogen = 6.978 %. Percent mass of…

Q: Consider a mixture of three different gases: 1.90 g of argon (molecular mass = 39.948 g/mol), 3.10 g…

A: Argon, neon and helium gases do not react with each other in a mixture as they are inert gases.…

Q: - 22 A copper atom has a mass of 1.06 × 10 g and a penny has a mass of 2.5 g. Use this information…

A: Number of atoms in 1 mole of copper = 6.022 × 1023 atoms  Mass of one atom of copper = 1.06 x 10-22…

Q: A copper atom has a mass of 1.06 × 10^-22 g and a penny has a mass of 2.3 g. Use this information to…

A: Mass of one Mole of Cu is =  Mass of one Cu atom × Avogadro number.

Q: A compound of copper and sulfur contains  94.16 g  of metal and  47.01 g  of nonmetal. How many…

A: Here metal is copper and non metal is sulphur.  The mass percent of copper and sulphur are…

Q: Hydrogen peroxide (H2O2) is a mild antiseptic used to prevent infection in minor cuts and scrapes.…

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Q: Determine the number of each type of atom in each of the following formulas. ▼ Part A NH4Cl Express…

A: We have to tell number of each type of atom . It can be easily determined by observing the given…

Q: What is the mass of 6.42 × 1023 Al atoms? (Provide your answer with the correct number of…

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Q: Tia has a sample of pure gold (Au). She weighed the sample and the result was 84.784.7 grams. Tia…

A: First of all calculate the number of moles of gold by using formula- mole = mass/molar mass then…

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.