Relative abundance and atomic mass of the naturally occurring isotopes of hafnium: 5% - 176 amu 19% - 177 amu 27% - 178 amu 14% - 179 amu 35% - 180 amu What is the average atomic mass of hafnium? A) 176 amu B) 177 amu C) 179 amu D) 180 amu

Q: What is the mass in grams of 6.62 mol W

A: Given, moles of W= 6.62 mol Molar mass of W = 184g/mol (from periodic table)  Mass in grams = ?

Q: In what mass units are the average atomic mass and molecular mass expressed? What is the value of…

A: The average atomic mass and molecular mass is expressed in atomic mass unit (amu). It is defined as…

Q: What is the mass (in grams) of 0.263 moles of water?

A: Moles of water=0.263molTo find the mass of 0.263 moles of water (H2O), you can use the molar mass of…

Q: How many atoms of vanadium are in 1.28 grams of vanadium ?

A: 1 mole of vanadium contains Avogadro’s number of atoms. The number of mole of 1.28 g of vanadium…

Q: 4. What is the mass of 7.75 moles of magnesium metal?

A:

Q: How many grams of iron are combined with 45.1 grams of oxygen to make the iron(II) oxide compound?

A: Balanced reaction taking place is as follows: Molar mass of Fe = 55.845 g/mol Molar mass of O2 = 32…

Q: How many oxygen atoms are in 2.50 moles of C6H12O6?

A:

Q: What is the mass in grams of 68.3 mol Xe?

A: Mole can be defined as a standard unit for measuring large quantities of very small entities such as…

Q: What is the mass of 1.6x10^21 argon atoms?

A: Molar mass of Argon is 39.95 g/mol i.e 1 mole of argon = 39.95 g of Argon Number of atoms of Argon…

Q: A student started with a sample of an element X of 10.34 grams. The mass of oxygen is 1.59 g. given…

A:

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: Determine the number of atoms of C in 43.7 grams of C₆H₁₂O

A: Atom is composed of neutrons, protons, and electrons.

Q: Determine the number of atoms of C in 11.8 grams of C₆H₁₂O₆.

A: Since, Moles is the ratio of mass to the molar mass of that atom or molecules. Also, Number of atoms…

Q: An aluminum plant produces 60 million kg of aluminum per year. How much aluminum oxide is required?

A: The amount of Aluminum oxide required to produce 60 million aluminum per year is given below

Q: What is the mass of a sample containing 1.00 mol of atoms, 33% of them N and 67% of them O?

A: The objective of the question is to calculate the mass of a sample containing 1.00 mol of atoms, 33%…

Q: An atom consists of two isotopes, the first with an atomic mass of 15.8967 amu and the second with…

A: Atomic mass of first Isotope = 15.8967 amu Atomic mass of second Isotope = 16.8245 amu Average mass…

Q: How many moles of Ni are in 6.53*10^25 Ni atoms?

A: The number of atoms of any element is given by, => Number of atoms = moles X Avogadro's number…

Q: How to convert from mass percent to mass of an element ?

A: We can calculate mass of element if we have have information about mass percent and total mass.

Q: How much orygen is produced from 2.56 X 10 g HgO?

A: Number of moles = mass/molar mass  Mass = moles × molar mass  Molar mass of HgO = 216.59 g/mol…

Q: How many grams of oxygen are combined with 94 grams of iron to make the iron(II) oxide compound?

A: Given: Oxygen is combined with iron to give iron(II) oxide. Mass of iron = 94 grams.

Q: An unknown compound containing tellurium and bromine is analyzed and it is determined that 28.53% of…

A: According to given data%mass of Tellurium in compound=28.53 %and% mass of Bromine in compound=71.47…

Q: Given 88.0 grams of Boron, how many atoms of Boron (B) are present

A: To know, number of atoms, first we have to find out number of moles.

Q: How many atoms of copper are there in 0.0075 g of copper?

A:

Q: how many atoms are present in a 1.48 micromol

A: 1 mole of any substance contains Avogadro number of entities  Avogadro's number = 6.022 x 1023…

Q: How many atoms of vanadium are in 1.28 grams of vanadium ?

A: Given: Mass of Vanadium = 1.28 g Atomic mass of Vanadium = 51 g/mol To Calculate: Atoms of Vanadium…

Q: molar mass

A:

Q: How many grams of iron are combined with 62.2 grams of oxygen to make the iron (II) oxide compound?

A:

Q: 5) Find the mass of 0.02 moles of K,Cr,O,. 7'

A:

Q: How many Sn atoms are there in a 20.7 gram sample of Sn ?

A: Avogadro's  number gives the number of atoms, molecules or ions in one mole of the substance and it…

Q: A sample contains 28.0 mg of Cu -64. How many atoms will remain in 40.0 days?

A: We have 28.0 mg of Cu-64 isotope. We need to calculate the remaining atoms after 40 days.This…

Q: What mass of oxygen would be in a 124.56g sample of sodium thiosulfate Na2S2O3?

A: Given that:  Mass of Na2S2O3 = 124.56g  Molar mass of Na = 23g/mol Molar mass of S = 32g/mol Molar…

Q: What is the mass of 1.761 × 10^8 mol S? Answer in units of g.

A:

Q: How many moles of mercury (Hg) would be found in 250. grams of mercury?

A: Given that: mass of Hg = 250 g To find: number of moles of Hg?

Q: Determine the mass, in grams, of 0.805 moles of S (1 mol of S has a mass of 32.07 g).

A: The general expression that shows relationship between moles and mass is as follows, Moles=MassMolar…

Q: What is the mass of 9.455* 10^-3 mol of P4?

A: Given- Mole of P4 = 9.455 x 10-3 mole To find- Mass of P4

Q: If a sample of N2O4 contains 19 g of nitrogen (N), how many moles of N2O4 are in that sample?

A: Since in 1 mole of N2O4 we will have 2 moles of N Hence moles of N2O4 = moles of N / 2  Since moles…

Q: What is the mass of 0.900 mol of BCl3?

A:

Atoms and Molecules

An atom is the smallest unit of an element that possesses all the properties of that particular element. Molecules are the smallest unit of a substance that possess all the properties of that particular substance.