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: What is the name of the element that is in group 5A and period 3? What is the name of the element…

A: A question based on periodicity properties that is to be accomplished.

Q: In the table below, there are descriptions of an experiment on samples of three different chemical…

A: Given that : We have to identify whether the elements are metal or non-metal form the given…

Q: We experimented on various elements: Mossy Zinc, Aluminum Turnings, Copper Turnings, Activated…

A:

Q: Calculate the number of atoms in each of the following quantities:  a. 10.8 g boron  b. 20.0 g…

A: “Since you have posted a question with multiple sub-parts, we will solve first three sub-parts for…

Q: What is the radius (in cm) of a pure copper sphere that contains 1.14 * 1024 copper atoms? [The…

A: Given information:

Q: Change 1 Change 2 Change 3 Change 1 is: Change 2 is: Change 3 is: impossible impossible impossible a…

A: Applying definition of physical and chemical changes. A change which provides new matter is chemical…

Q: Search the web or your textbooks for an illustration of Mendeleev’s periodic table. How many…

A: Given : Mendeleev periodic table  To find : Describe it properly Solution : There are thousands of…

Q: An electric current is passed through 60.0 mL of water (H2O). This converts the water into 53.33 g…

A: Given  Volume of water = 60 mL  Mass of Oxygen  = 53.33 gram Mass of hydrogen gas  = 6.67 gram…

Q: In the table below, there are descriptions of an experiment on samples of three different chemical…

A: Given that : We have to identify whether the elements are metal or non-metal form the given…

Q: In an experiment, 0.237 g of zinc metal reacts to produce 0.501 g of zinc oxide. Using the Law of…

A: Given, Mass of zinc metal = 0.237 g Mass of zinc oxide = 0.501 g

Q: The chemical name for Tums is calcium carbonate, CaCO3, is used to treat symptoms caused by too much…

A: Given: Mass of CaCO3 = 522.61 mg = 0.52261 g                                                 (Since…

Q: A sample of metal weighing 2.24 g is combined with oxygen; the metal oxide weighs 23.5 g. The mass…

A: Given values-> Weight of metal = 2.24gram Weight of metal oxide = 23.5gram

Q: À 7.45 g sample of calcium carbonate completely decomposes into calcium oxide (lime) and carbon…

A: Answer :-  1) only 3  i.e. The original solid is not an element.…

Q: Suppose that mercury forms a perfect spherical droplet with a diameter of 5.0 mm. (a) What is the…

A: Density is given by the ratio of mass of the substance to its volume. 1 mole of a substance contains…

Q: There are four sketches below. The first sketch shows a sample of Substance X. The three sketches…

A: Answer:- This question is answered by using the simple concept of physical change and the chemical…

Q: Sample of Substance X Change 1 Change 2 Change 3 Change 1 is: Change 2 is: Change 3 is: O impossible…

A: Physical changes are those changes in which only Physical state of matter change, while their…

Q: . Using the measured circumference (c= 21.3 cm) of the glass ornament, calculate the radius in cm.…

A: We have to find How many silver atoms thick is the lining?  Given radius of a silver atom is 160 pm

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: Carbon can react with hydrogen to form several different compounds. Two compounds that contain only…

A: Law of multiple proportions relate the mass number of reactants.

Q: There are two gas compounds that are made out of element  A and B. This is the mass percentage of…

A: Given: Mass percentage: Compound 1: 30.43% A, 69.57% B Compound 2: 63.64% A, 36.36% B

Q: In the figure shown, is a chemical reaction occurring? Yes, because the atoms have rearranged to…

A: A reaction in which reacting atoms chemically combine with each other to form a new substance is…

Q: Tartaric acid is the white, powdery substance that coats sour candies such as Sour Patch Kids.…

A: To solve this problem first we find the mass of C , H and O  Then the number of mole of each to get…

Q: For each of the following elements, write its chemical symbol,locate it in the periodic table, give…

A:

Q: Pure gold is usually too soft for jewelry, so it is often alloyed with other metals. How many gold…

A:

Q: Calculate the mass of a gold-197 atom using the information from question 9 and the masses of the…

A: The ratio of mass to the volume of the solution is known as density.

Q: The element silicon has a melting point of 1,410°C and a boiling point of 2,355°C. It is a weak…

A: Since in the question it is given that it reacts with O2 i.e oxygen in air and form SiO2 i.e silicon…

Q: Hi, I am doing a practice test and need to check my answers. All of this is for Chem 101   Please…

A: 1) A compound forms whenever two or more atoms  form chemical bonds with each other. The chemical…

Q: gas. D. Matter with a defined shape and defined volume. E. The formation of new substances by…

A: We have to match the right answer

Q: Part 1: Vocabulary Define the following terms: (from what you remember from middle school) Matter:…

A: Answer for part 1 Matter It is the substance of which any physical object consist. Atom It is the…

Q: Earth’s surface area is 5.1 x 108 km2, its crust has an average thickness of 35 km and an average…

A: Since the volume of earth will be = surface are of earth X thickness of earth = 5.1 X 108 X 35 =…

Q: Two samples of sodium chloride with different masses were decomposed into their constituent…

A: Law of definite proportion :  The law states that a compound has its elements in a fixed ratio…

Q: Use the following information to determine the mass of chlorine combined with the magnesium to two…

A: Given, mass of crucible = 35.1  mass of crucible and magnesium = 38.92  mass of crucible and…

Q: What is the mass of magnesium fluoride that contains 7.29 × 1024 F atoms?   Relative atomic…

A: Given,  The mass of magnesium fluoride that contains 7.29 × 1024 F atoms is:

Q: The volume of a sample of lead (density 11.3 g/cm) was determined to be 13.4 cm3. Calculate the mass…

A: Mass of the sample = volume x density                                 = 13.4 cm3 x 11.3 g/cm3…

Q: How many atoms are contained in a block of aluminum metal measuring 6.0 mm x 5.0 mm x 15 mm? The…

A:

Q: Identify the elements in each chemical formula, and give the number of atoms of each element. a.…

A: a. NaCN (sodium cyanide) Elements : Na , C and N. Number of C atoms = 1 Number of Na atoms = 1…

Q: 4. Fluorine is the most abundant nonmetal in the universe. 5. Iodine can be easily obtained from…

A:

Q: Use the conversion factor: 1 amu=1.66054x10-24 g to answer the questions. 1. How many atomic mass…

A:

Q: There are four sketches below. The first sketch shows a sample of Substance X. The three sketches…

A: Chemical change: The process in which the molecular composition is completely changed, and a new…

Q: Sample of Substance X Change 1 Change 2 Change 3 Change 1 is: Change 2 is: Change 3 is: O impossible…

A: Physical change is defined as the one in which the form/state of the particle changes but their…

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: A 1.58 mole sample of a pure unknown substance has a density of 1.87 g/cm3. If the sample occupies a…

A: Given,Density = 1.87 g/cm3Volume = 188 cm3Mole = 1.58 mole

Q: If 81.17 grams of aluminum and 72.03 grams of the iron oxide are used, what mass of iron was…

A: Mass of Iron produced depends on limiting reagent.

Q: If 2% of the mass of a human body is calcium, how many kilograms of calcium are there in a 150-pound…

A: • The values provided in the question are:-  i) Mass of a man     = 150 lb      = 150 × 0.454 kg {∵…

Q: There are four sketches below. The first sketch shows a sample of Substance X. The three sketches…

A:

Q: 1. a) Calculate the mass percent of NaHCO3 based on the manufacturer's list of ingredients: 325 mg…

A: mass % of NaHCO3 = mass of NaHCO3 in tabletsum of mass of all ingredients x 100 sum of mass of all…

Q: Fill in the blank using the following words: atom, atomic number, electron, proton, neutron, metal,…

A:

Q: A piece of copper contains 6.7×108 atoms. What is the mass of the sample, in units of kilograms

A: molar mass of Cu = 63.55 g/molThis is mass of 6.022×1023 atomsuse:mass of 1 atom = molar…

Q: metal g/cm3 aluminum 2.70 zinc 7.13 iron 7.87 copper 8.96 Using the table above determine the…

A:

Q: Determine the nuclear composition (number of protons and neutrons) of the following isotopes. (a)…

A: Since you have posted questions with multiple sub-parts, we are entitled to answer the first 3 only.…

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.