If the density of lead is 11.34 g/cm³, how many atoms are there in a lead piece of 2.5 cm wide, 1.00 m long and 2.1 mm thick? (Pb: 207 g/mol, NA=6,02x 1023) A) 1.73x103 B) 1.73x10²4 C) 1.03x104 D) 1.03x103 E) 6.03x 10²3

Q: Some salts have water of hydration and are called hydrated salts. A 3.216 g sample of a hydrated…

A: Step‐1       Given,       mass of hydrated salt  Nax By Oz .X H2O=3.216g       mass of  anhydrous…

Q: If the m. Wt. of BaSO4 = 233.42 g/mol %3D and m. Wt. of Na(SO4)2= 140.02 g/mol and wt of…

A:

Q: The natural isotopes of boron are B-10 and B-11. If borons atomic mass is 10.81 amu, what is the…

A: Given : Atomic mass of Boron = 10.81 amu. And the isotopes of boron are  1) B-10 with atomic mass =…

Q: An element (A) has 5 isotopes. The masses (and abundances) of the isotopes 46A, 47A, 48A, 50A are…

A: Given:Average atomic mass = 47.87u.49A/50A = 3.361.

Q: Silicon, which makes up about 25% of Earth's crust by mass, is used widely in the modern electronics…

A: Average atomic mass- Naturally occurring element exists as mixture isotopes. Isotopes are with…

Q: Your doctor has diagnosed you as being anemic-that is, as having too little iron in your blood. At…

A:

Q: One atom of lithium, Li, reacts with fluorine, F, to produce lithium fluoride, LiF2. The atomic mass…

A: Which statement about the reaction is correct?

Q: Calculate the average atomlc mass of lithlum, whlch occurs as two Isotopes that RVU Mu following…

A: We need to calculate average mass from given mass and relative abundance of isotopes.

Q: An unknown element X has the following isotopes: 140X (89.00% abundant) and 142X(11.00% abundant).…

A: Since,         Average Atomic mass=Σass of Isotope×% of Isotope100

Q: ow do I find how many atoms are in 3.80g of silver?

A: Introduction: We have calculate the atoms in 3.80g of silver.

Q: 1. The charge required to deposit 40.5 g of Al (atomic mass = 27.0 g) from the fused Al,(SO), is:…

A: here the question is from faraday law :- According to the Faraday law , the masses of different ion…

Q: An unknown element is a mixture of isotopes 120X and 122X. The average atomic mass of X is 121.03…

A: ]Average atomic mass=Σ%abundance x mass of isotope100

Q: How many copper atoms are in a cube of copper metal measuring 1.33 cm on each edge? The density of…

A: Volume of copper cube = 1.33 cm x 1.33 cm x 1.33 cm                                            =…

Q: How many atoms of lead are required to cover a 37.0 cm by 55.0 cm area with a sheet of lead that is…

A: The required volume to cover =  37.0 cm×55.0 cm×0.142 cm…

Q: Verify that the atomic weight of lithium is 6.94, given the following information: 6 Li, mass =…

A: Given,  Percent abundance of 6Li = 7.50% Mass of 6Li = 6.015121 amu Percent abundance of 7Li =…

Q: D. Which of the following sentences best describes what is happening in the balanced equation shown…

A: The balanced chemical reaction is the representation of the chemical species involved along with…

Q: If the density of lead is 11.34 g / a.m., how many atoms are there in a piece of lead 2.5 cm wide,…

A: To calculate the number of atoms in the sample, we must have the number of moles of the substance.…

Q: An imaginary element Z has two naturally occurring isotopes, ³Z and 4Z. ³Z has a mass of 3.016 amu,…

A:

Q: A 6.700-g hydrate of sodium sulfate, Na2SO4-nH2O loses 2.896 g of its mass upon heating. The mass…

A: In this question, we will determine the value of n ( where n is the number of water molecules )…

Q: What is the average atomic mass of element X if it exists as 19.90% with a mass of 10.18 and 80.10%…

A:

Q: How many hydrogen atoms are there in 8.75 g of C,H,NO,? Select one: a. 23 4.79x 10 b. 3.22x 1023 с.…

A: Given: Mass of C2H7NO2 = 8.75 g Molar mass of C2H7NO2 = 77.08 g/mol

Q: Compute the númber of ions present in 5.85 g of sodium chloride. (Given, NA = 6.022 x 102, atomic…

A:

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

A:

Q: QUESTION 7 _C2H4 +_ 02 = _CO2+ _ H2O - When the above equation is balanced using smallest whole…

A:

Q: When barium (Ba) reacts with sulfur (S) to form bariumsulfide (BaS), each Ba atom reacts with an S…

A: Since there are 1:1 ratio of atoms in the molecules, and it concludes that the same amount of each…

Q: An experimental determination of the percent abundances of the three isotopes of magnesium is given…

A: Given data:

Q: An unknown element X has the following isotopes: ²⁵X (80.5% abundant) and ²⁷X (19.5% abundant). What…

A: Given :  element X has the isotopes: ²⁵X (80.5% abundant) and ²⁷X (19.5% abundant).  Since Atomic…

Q: Titanium has five common isotopes: 46Ti (8.000%, 45.95 amu), 47 T (7.800%, 46.95 amu), 48Ti (73.40%,…

A: Given 46Ti (8.000%, 45.95 amu), 47 Ti (7.800%, 46.95 amu), 48Ti (73.40%, 47.95 amu), 49Ti (5.500%,…

Q: An unknown element is a mixture of isotopes ¹²⁰X and ¹²²X. The average atomic mass of X is 121.47…

A: For an element that exists as a number of isotopes, its atomic mass is calculated by taking an…

Q: Boron and sulfur form two binary compounds. The first contains 0.2247 g B/1.000 g S, and the second…

A:

Q: A solid circular cone made of pure platinum (d = 21.45 g/cm3 ) has a diameter  of 2.75 cm and height…

A: Density of a substance is given by the ratio of mass to its volume. Density = MassVolume Volume of a…

Q: Consider a rectangular piece of printer paper that is 8.5’’ x 11’’ (’’ denotes inches). In order to…

A:

Q: How many electrons is the element Strontium (Sr) likely to gain or lose?

A: Strontium is represented by Sr. The atomic number of Sr is 38. Sr Electronic configuration = [Kr]…

Q: Calculate the number of atoms of hydrogen (H) in 323 cm3 of the colorless gas ethylene at 0 °C and…

A: 1 mole of C2H4 (ethylene) has 2 moles of carbon and 4 moles of hydrogen in it.1 mole of any…

Q: Q11/ Calculate he equivalent weight of K2SO4, if you know the atomic weight of K=39, S=32, O=16.

A: Potassium sulphate = K2SO4 --> 2K+ + SO42- molecular weight = 174 (2x39 + 32 + 4x16)

Q: By x-ray diffraction it is possible to determine the geometric pattern in which atoms are arranged…

A: Given that : The edge length of the cube = 0.409 nm The density of silver = 10.5 g/cm3 The molar…

Q: A cylindrical piece of pure titanium (Ti, density=4.506 g/cm^3) has diameter d=1.15 cm and length…

A:

Q: An unknown element X has the following isotopes: $2X (84.50% abundant), 49X (8.00% abundant), 5°X…

A: Given element has three isotopes Isotope - 1 : 52X Mass number (A1) = 52 Percentage abundance (X1) =…

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: 2.2. Boron has two naturally occurring isotopes, 1 B and "B. We know that 80.22% of its atoms are…

A: Answer: 2.2) Atomic weight of 10B 10.0084 u 2.3) Average atomic mass of Boron 10.81 g

Q: An unknown element is a mixture of isotopes 151X and 153X. The average atomic mass of X is 151.69…

A:

Q: A sample of 0.262 mol of a metal M reacts completely with excess fluorine to form 20.5 g of MF2.…

A:

Q: The atomic weight of Aluminum element is 26.981 g/mol and atomic number is 13, the number of…

A:

Q: Calculate the mass of antimony(III) lodide, Sblg, that can be produced by the reaction of 143 g of…

A:

Q: How many atoms are in the sugar in this cup?

A: Given :- mass of sucrose = 180 g  To calculate :- number of atoms in sucrose

Q: Since 1983, pennies have been made with zinc and plated with copper. Prior to 1983, pennies were…

A: Since from 1793-1837 pennies were made up of pure copper therefore, if you had a penny from 1800…

Q: xplain how the atomic mass unit (amu) is defined and (ii) explain how the definition of an amu in…

A: A Unit of mass is used to explain the atomic weight....i. e amu. Atomic mass is the quantity of…

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.