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

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: How many moles of oxygen atoms are there in 15. 53 moles of N02?

A: Given -> Moles of NO2 = 15.53 mole

Q: 4. Find the mass of 3.66 mol of N2, nitrogen gas.

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

Q: How many moles of Al are there in 41.5 grams of Al?

A: Since number of moles of atom = mass of atom / Atomic mass of atom

Q: 22 11. Find the mass in grams of 2.54 x 10 molecules of H,SO,.

A: Number of molecules of H2SO4 = 2.54 × 1022 molecules. Mass of H2SO4 (in grams ) = ?

Q: What is the mass, in grams, of 557 copper atoms?

A: Given, number of atoms of copper =557 we are asked to calculate the mass (in grams) of 557 copper…

Q: How many grams of Kr are there in a sample of Kr that contains 6.43×1023 atoms?

A: What is one-mole? Mole is a unit of measurement. One mole of a substance is something that contains…

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

A:

Q: How many Mn atoms are there in 2.63 moles of Mn?

A: 1 mol consists of 6.022×1023 atoms

Q: Tin has 10 stable isotopes. The heaviest, 124Sn, makes up 5.80% of naturally occurring tin atoms.…

A: a) The number atoms of 124Sn are present in 25.0 g of naturally occurring tin is to be calculated.…

Q: In an experiment, a specific amount of KClO3 is allowed to decompose to produce 4.40 g of KCl. How…

A: Given Mass of KCl produced = 4.40 g To find Mass of O2 produced in the experiment.

Q: A gallon of water has a mass of 3.79 kg. How many moles of water (18.02 g/mol) is this?

A: Given : Mass of water = 3.79 Kg  And molar mass of water = 18.02 g/mol

Q: How many grams of gold (Au; atomic mass = 197.0 g/mol) contains 2.5 x 1020 gold atoms?

A: Number of moles = mass/molar mass  Mass = moles × molar mass  Molar mass of Au = 197.0 g/mol

Q: (c) 54.5% C, 9.2% H, and 36.3% O by mass

A: given :-  percentage composition of C = 54.5%  percentage composition of H = 9.2%  percentage…

Q: Suppose 2.367g of TiO2- containing sample evolves 0.143g of O2. What is the mass percent of TiO2 in…

A: The equation involved in the determination of purity of TiO2 sample is as follows.…

Q: 3.123 In the formation of carbon monoxide, CO, it is foundthat 2.445 g of carbon combine with 3.257…

A:

Q: Find the Mass of 3.65 x10² mole K,SO,?

A: Number of moles of K2SO4 = 3.65 × 10–2 mol  Molar mass of K2SO4 = 174.26 g/mol

Q: If the mass percentage of O in a sample is 68% and the total mass of the sample is 4.128 Kilograms-…

A:

Q: Phosphorus burns in air to produce a phosphorus oxide in the following reaction: 4P(s) + 50,(g) –→…

A:

Q: 9. If a cabin et is made of 5.65 grams of Gold, how many atoms of gold are in the cabinet?

A:

Q: 26. 78) 6.347 x 10°atoms of nickel(III) sulfide has a mass of

A: Given, number of atoms of nickel(III) sulfide =6.347×1026 atomswe are asked to calculate the mass of…

Q: what is the mass of 0.35 mol of K2S ?

A:

Q: the atomic mass of C is 12.011u. How many moles of C are there in 3.50g sample of carbon?

A: Converting Mass to molesAtomic Mass of C = 12.011 Mass of C in a sample = 3.50Calculate the Number…

Q: natural rubidium has the average mass of 85.4678 AMU and is composed of isotopes Rb 85 (mass =…

A: Average atomic mass = ∑i=1XiMiWhere X = mole fraction of the isotope and M is the mass of the…

Q: I want to know at least some reason why the mass of the Mgo formed could be lower that expected

A: Interpretation -  To tell about a reason why the mass of the MgO formed could be lower that expected…

Q: 2) How is the mole similar to a dozen?

A: (2) Answer- A mole is a unit of counting particles such as atoms, molecules, ions etc. which…

Q: How much does 8.44 x 1063 molecules of water weigh?​

A: Molecular weight of water =18g/mol i.e. 1  mol of water (6.023 x 1023 molecules) of water has mass…

Q: How many Kr atoms are there in a 56.7 gram sample of Kr ?

A:

Q: Natural rubidium has the average mass of 85.4678 u and is composed of isotopes85Rb (mass = 84.9117…

A: Mass of the Rb = 86.913 amu. Given data: 85.4678 amu is average mass of the Rb Mass of 85Rb =…

Q: What is the mass in grams of 2.68 * 1022 atoms of uranium?

A:

Q: The molar mass of platinum is 195.08 g/mol. What is the mass of 1.00 × 102 Pt atoms?

A: Given information: Molar mass of Pt = 195.08 g/mol Atoms of platinum = 1.00 × 102

Q: A gold ring contains 3.01 x 1023 atoms of gold, Au. How many grams of gold are in the ring?

A: The number of moles (n) of a substance is calculated by dividing its number of atoms (No) by…

Q: If you have a ring that contains 1.94 g of gold, how many moles of gold are in that ring?

A: Number of moles = mass / molar mass

Q: Which weighs less, 0.25 mole of xenon atoms or 2.0 moles of carbon atoms?

A: The mass of 0.25 mole of xenon atoms can be calculated as

Q: Determine the mass, in grams, of 0.130 moles of I (1 mol of I has a mass of 126.90 g).

A: A mole is thus the mass of a compound in grams that equals the masses of the elements that is…

Q: Covert 2.34 x 10^24 molecules of N2 to moles

A:

Q: 1. What is the mass of 4.16 mol of Cu?

A: Mass of Cu = ?  Moles of Cu = 4.16 moles

Q: Calculate the mass of two atoms of Cr, Mo and W?

A: Mass of one atom of Cr is 52 u. Therefore, mass of two atoms of Cr is 104 u that is 252 u=104 u

Q: What is the average atomic mass of a mystery substance that is 27.5 at a mass of 37g and 72.5% at a…

A: Given: Mass =37 g  Percentage %=27.5 % Mass =38 Percentage % =72.5% Average mass=?

Q: What is the average mass, in grams, of one Zn atom?

A: Given :- Number of atoms of Zn = 1 atom  To calculate :-  Average molar mass of single atom of Zn…

Q: What is the mass of 1.595 moles of argon?

A:

Q: A 21.37 gram sample of an unknow element contains 0.3267 moles what is the identity of the element

A:

Q: 49.4g of Cr represents how many atoms?

A: Number of Atoms = moles of Atom X Avogadro's number  Avogadro's number  = 6.022 X 1023  And moles of…

Q: Natural rubidium has the average mass of 85.4678 u and is composed of isotopes85 Rb (mass = 84.9117…

A: Mass of the Rb = 86.913 amu. Given data: 85.4678 amu is average mass of the Rb Mass of 85Rb =…

Q: What is the mass of 2.561 mol of gold?

A: A pinch of salt contains as many particle of NaCl that cannot be counted as such. The unit Mole (…

Q: 49.4 g of Cr represents how many atoms?

A: Number of atoms = moles of Atoms X Avogadro's number where Avogadro's number = 6.022 X 1023  And…

Q: 8. How many milligrams of iron are delivered from a 250. mg tablet of FeSO,-7H,O? Percentage %CaCl,…

A: Q9) U3O8 molar mass                 Atomic mass of U =238       Atomic mass of oxygen =16…

Q: What is the representative particle, mass(g), no. of particles of carbon dioxide

A: 1mole of any substance contains 6.023*1023 molecules or particles, it is also called one avagadros…

Q: How many gold (Au) atoms are there in a 5.0 g sample of that is 50% Au by mass?

A: Answer: 7.6421 × 1021 number of gold (Au) atoms are there in a 5.0 g sample of that is 50% Au by…