If a sample of lithium contains 2.50x10* atoms of lithium-7 and 2.00×10 atoms of lithium-6, what is the percentage of lithium-6 atoms in the sample?

Q: A mass of 145 g of a certain element is known to contain approximately 3.64 x1024 atoms. What is the…

A: Let the molecular weight of the element is M gm/mol.  Moles = weight/mol. wt.  Or, moles = 145/M  We…

Q: If 4.18x10^22 atoms of element Y have a mass of 2.46g what is the identity of element Y

A:

Q: How many silicon atoms are there in 1.00g of silicon?

A: Given: Mass of silicon=1.00 g Mass of 1 mole of silicon=28.0855  g

Q: How many moles are there in 2.75 x 10^24 atoms of copper?

A: we know that one mole of copper contain Avogadro's number of atoms Avogadro's number= 6.023 × 1023

Q: A sample of aluminum foil contains 9.50×1023 atoms.9.50×1023 atoms. What is the mass of the foil?

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

Q: How much does 4.28 x 10 21 atoms of Nickel weigh?

A: We know that, one mole of any substance contains 6.022 × 1023 atoms. We can determine the weight by…

Q: A pure silver ring contains 4.55×1022 silver atoms. How many moles of silver atoms does it contain

A: A mole of a substance is equal to as many entities (atoms , molecules and ion ) as there are number…

Q: What is the mass of 4.97×1021 platinum atoms?

A: Mass has many units. Its SI unit is Kg. On atomic level, atomic mass unit, molar mass, molecular…

Q: 18. How many moles of gold atoms do 3.45 X 1044 gold atoms constitute?

A: We know that the number of atoms is given by below expression  number of atoms = moles X avogadro…

Q: For which element does a sample of 1.5055 × 1024 atoms have a total mass of 70.215 g?

A: The objective of the question is to identify the element for which a sample of 1.5055 x 10^24 atoms…

Q: Calculate the mass, in grams, of 262 atoms of cesium, Cs (1 mol of Cs has a mass of 132.91 g).

A: Molar mass = 132.91g I mol of Cs contains 6.022×1023atoms  Therefore mass of 6.022 × 1023 atoms =…

Q: A compound of iodine and cesium contains 63.94 g of metal and 61.06 g of nonmetal. How many grams of…

A:

Q: A 64.36 g sample of XO2 contains 25.79 g of oxygen atoms. What is element X?

A: Given,      A 64.36 g sample of XO2 contains 25.79 g of oxygen atoms . To determine the identity…

Q: A sample of aluminum foil contains 4.50×1023 atoms.4.50×1023 atoms. What is the mass of the foil?

A: Given,  Number of atoms of Al foil = 4.50 x 1023 atoms  Mass of the Al foil = ?

Q: Carbon exists as 3 isotopes. It is 88% C-12, 1% C-13 and 11% C-14. What is the average atomic mass…

A: average atomic mass= isotop% multiplied by atomic mass /100

Q: How do I calculate the mass of 6.20 x 10^22 tungsten atoms?

A: Given : Number of tungsten atoms = 6.20 x 10^22  Molar mass of tungsten = 183.84 g/mol

Q: Suppose the diameter of a type of atom is 2.22 x 10-7 mm. A coin has diameter 1.20 cm. Suppose the…

A: If we divide the diameter of a coin by the diameter of an atom we will get the no. of atoms.  Given…

Q: How many grams does 1.44 x 1028 carbon atoms weigh?

A: To calculate the mass in grams for the atoms  First we have to convert the number of Atoms into…

Q: What is the mass in 3.52 x 10^23 water molecules?

A: mass of 3.53 ×1023 molecules is 10.45g

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: If 7.736 g of a pure element contains 3.825×1022 atoms, what is the element?

A: In chemistry, the molar mass of an element is the mass of one mole of that substance, expressed in…

Q: A sample of aluminum foil contains 6.50×1023 atoms.6.50×1023 atoms. What is the mass of the foil?

A: Mole concept: The number of molecules or atoms present in the one mole of the substance is equal to…

Q: A sample of trifluoroacetic acid, C2HF3O2, contains 32.1 g of oxygen. Calculate the mass of the…

A: Given,  Mass of O in a sample of C2HF3O2 = 32.1 g Calculate the mass of C2HF3O2 sample = ?

Q: Element X has two natural isotopes: X-6 (6.015 amu) and X-7 (7.016 amu). Calculate the atomic mass…

A: Percentage abundance of X-7 = 92.5% Percentage abundance of X-6 = 100 – 92.5 = 7.5%

Q: A newly discovered element, X, has 3 isotopes weighing 350 amu, 355 amu, and 357 amu. If the…

A: Given:3 isotopes of X weighs 350 amu, 355 amu, and 357 amuAbundances of these isotopes are 50.0 %,…

Q: Consider a sample of carbon tetrafluoride that contains 2.35 × 10²⁴ atoms of fluorine. What is the…

A: Carbon tetrafluoride is also called  Tetrafluoromethane and it is covalent compound  in which carbon…

Q: In 100.5 g of water (H2O), how many total atoms are there?

A: Number of atoms in a molecule = Atomicity of molecule x no. of moleculeNumber of molecule = no. of…

Q: What is the mass of a mole of electrons if one electronhas a mass of 9.11 × 1 0 -28 g?

A: Because, 1 mole=6.022×1023 molecules/particles Therefore, 1 mole of electron=6.022×1023 electrons

Q: How many grams of Platinum (Pt) contain the same number of atoms as 5.0g of lithium (Li)

A:

Q: Bromine has an average atomic mass of 79.904 amu. If Br-79 has a mass of 78.92 amu and Br-81 has a…

A:

Q: A pure titanium bicycle frame contains 1.61 x 10^25 titanium atoms. What is its mass in kilograms?

A: 1 mole of any substance contain 6.022 × 1023 unit of that substance. that substance may be atoms,…

Q: How many atoms are contained in a block of aluminum metal measuring 4.0 mm x 9.0 mm x 11 mm? The…

A:

Q: Consider 8.63 x 1021 atoms of boron.   How many moles of boron does this represent?

A: 1 mol of atom  = Avogadro's number

Q: How many atoms are contained in a block of aluminum metal measuring 8.0 mm x 6.0 mm x 15 mm? The…

A: Given, length of aluminum block = 8.0 mm = 0.8 cm                            ( since 1 mm = 0.1 cm)…

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: What would the mass be of Gold, if you had 6.02 x 10^24 atoms of

A: GOLD, molar mass of Au = 196.97 g/mol atoms of Au = 6.023 x 1023

Q: How many moles of N are there in a sample of N that contains 2.75×1024 atoms?

A:

Q: How many grams of Xe are there in a sample of Xe that contains 8.97×1023 atoms?

A: First we have to determine the moles of xenon.

Q: Bulk platinum cost about $1158 dollars per ounce (28.35 g = 1 ounce) how much would it cost to…

A:

Q: What is the mass in grams of 7.33 x 1023 atoms of lead?   How many lead atoms are there in 20.1…

A:

Q: One atomic mass unit has a mass of 1.6605402 × 10-24 g. a)Calculate the mass, in grams, of one…

A: The mean atomic mass of magnesium stands at 24.305 atomic mass units (amu). An atomic mass…

Q: Determine the mass (in grams) of aluminum present in 1.08 grams of Al2S3?

A: Molar mass of the elements is equal to the sum of the atomic masses of all the elements. Molar mass…

Q: A sample of water, H20, has a mass of 38.0 g. How many atoms of oxygen are in the sample? (oxygen…

A: Given,the mass of water ( H2O ) = 38.0 gatomic mass of H = 1.00 g/mol , O = 16.0 g/molAvogadros…

Q: what is the mass of 7.15 x 10^22 aluminum atoms?

A: Given, Number of Aluminium atoms = 7.15×1022

Q: Determine the mass in grams of 7.75 x 1021 atoms of carbon. (The mass of one mole of carbon is 12.01…

A: Given,the mass of one mole of carbon = 12.01 gNumber of carbon atoms = 7.75×1021 atomsHere, we are…

Q: If a sample of silver contains 1.29×104 atoms of silver-107 and 1.20×104 atoms of silver-109, what…

A: The percentage of silver-109 in the sample can be calculated by using the formula Percentage of…

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.