Why is the atomic weight of carbon reported as 12.011 in the table of elements and the periodic table in the front inside cover of this text?

Q: A sample of an unknown compound with a mass of 0.847 g has the following composition: 50.51 %…

A: Given, Mass of the compound = 0.847 g Percent mass of fluorine in the compound = 50.51 % Percent…

Q: many moles are in 38.9 grams of Al? Atomic weight of Al=26.98

A: Mass of Al = 38.9 g Atomic weight of Al = 26.98 g/mol Mole(n)= Mass(m)/Atomic weight

Q: Calculate the mass, in grams, of each of the fol

A: 1. Mole interms of particles :     1 mol = 6.022 x 1023 particles   2. Mole interms of  mass :…

Q: 4. What is the mass of 2.5 moles of Nickel (Ni) atoms?

A:

Q: Calculate the mass of H2SO4.

A: Mass of H2SO4 is 98.

Q: How many moles of calcium atoms do you have if you have 8.99 x 1021 atoms of calcium. (The mass of…

A:

Q: How many moles are in 38.9 of Al? Atomic Weight of Al= 26.98

A:

Q: How many moles of phosphorus atoms do you have if you have 4.00 x 1022 atoms of phosphorus. (The…

A: Please find the attached images for the answer

Q: How many moles of silver atoms do you have if you have 4.09 x 1021 atoms of silver. (The mass of one…

A: Given:- Number of atoms of Ag=4.09 x 1021 to calculate :- Number of moles of Ag.

Q: 7. How many sodium atoms is equal to five moles of the atoms? а. 5 b. 3.011 x 1024 с. 500 d. 6.022 x…

A: Mole represent  amount of substance present in any matter.

Q: How many hydrogen atoms are in one molecule of vitamin E?

A:

Q: What if you discovered Avogadro’s number was not 6.02 3 1023 but 3.01 3 1023? Would this affect the…

A:

Q: Calculate the number of atoms in each element. a. 25.8 g of Hg b. 0.0340 g of Zn c. 150 g of Ar d.…

A:

Q: What is the mass of 4.06 moles of sodium atoms?

A:

Q: Give the mass % of carbon in your compound  ___________________18.537956___________ Give the mass %…

A: Let us assume that there is 100 g of a compound. Hence it contains , Mass of carbon = 100 g of…

Q: What is the mass of 8.3 x 10^23 molecules of ibruprofen (C13H18O2 )?

A: Given data, Number of molecules of ibruprofen =8.3x1023 It is known that, one mole of a substance…

Q: How many Moles of magnesium phosphate do you have if you have 8.257 x 10^25 phosphate ions

A: Divide ion by Avogadro number to get mole

Q: A sample of the male sex hormone testosterone, C19H28O2, contains 3.58×1021 atoms of hydrogen. How…

A: Given,Testosterone contains 3.58×1021 atoms of hydrogen.

Q: 9.21 x10^19 molecules of hydrogen gas,(H2) are equal to how many grams of hydrogen gas?

A: Number of molecules = 9.21 × 1019 molecules Avogadro’s constant = 6.022 × 1023 molecules Numbre of…

Q: Calculate the mass, in grams, of 852 atoms of cadmium, Cd (1 mol of Cd has a mass of 112.41 g).

A: Mole : Mole of any element is ratio of atoms of element to the Avogadro number. If number of moles…

Q: How many grams do 2.2 × 1024 atoms of magnesium

A: Solution - The molar mass of Mg =  24 g / mol therefore 1mol of Mg atoms weight =24 g Mass of 2.20 ×…

Q: How many moles of iron atoms do you have if you have 5.60 × 10²³ atoms of iron. (The mass of one…

A: We know that 1 mole=6.023 x 10^23 atoms/molecules/ions Given, Number of atoms of iron=5.60 x 10^23

Q: How many moles of calcium atoms do you have if you have 5.60 × 10²¹ atoms of calcium. (The mass of…

A: The question is based on mole concept. We have to calculate moles of calcium.

Q: 22 the mass in grams of 6.35 × 10 molecules of CBr4.

A: Given, molecule : CBr4 number of molecules 6.35×1022

Q: How many atoms are in 48.4 grams of Pb? Atomic weight of Pb=207.20

A: Given data is as follows: The mass of Pb = 48.4 g The atomic mass Pb = 207.20 g/mol

Q: Why must atomic masses be weighted averages rather than conventional average values?

A: atomic mass is mass of atom which have amu unit .

Q: How many moles of calcium atoms do you have if you have 3.39 x 1021 atoms of calcium. (The mass of…

A: Calculation of moles of Calcium atom: The given atoms of Calcium = 3.39×1021 atoms The mass of one…

Q: Determine the number of atoms of Cin 26.9 grams of C12H22O11.

A: Sucrose is a disaccharide sugar and has a molecular formula C12H22O11. The molecular mass (M) of…

Q: How many moles of calcium atoms do you have if you have 8.62 x 1021 atoms of calcium. (The mass of…

A: Number of atoms of Ca is given for which number of moles is to be determined.

Q: A brass alloy contains 78.6% copper, Cu, by mass with the remainder of the alloy being zinc, Zn.…

A:

Q: Explain the concept of molecular weight ?

A: Molecular weight can be described as a sum of atomic mass of all the atoms present in a molecule.…

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: Get the number of particles of the following substances. а. Atoms of boron in 22.2 g boron, B b.…

A:

Q: How many moles of calcium atoms do you have if you have 5.65 × 10²¹ atoms of calcium. (The mass of…

A: Mol defination:  Mole in terms of particles:  1 mol = Avogadro no.of particles            = 6.02 ×…

Q: Oxygen 15.9994

A:

Q: A carbon- hydrogen-nitrogen compound has a molar mass of 114.20 g/mol and it has the following…

A: Empirical formula of a compound may be defined as the formula which gives simplest whole number…

Q: How many atoms of Pt are present in 2.53 moles of Pt?

A:

Q: Part B Magnesium makes up 2.10 % by mass of the Earth's crust. How many grams of magnesium are…

A: Mass percent :-  The mass of a component in grams present in 100 grams mixture of all components is…

Q: How many silver atoms are there in 5.71 moles of silver?

A:

Q: number of atoms in a 3.37×1033.37×103 g sample of carbon

A: 3.37×1033.37×103 g sample of carbon = 358693.061 g sample of carbon = 3.58 x 105 g sample of carbon

Q: What is the mass of 1.78 moles of P205? Use 2 decimals for your atomic weights and 2 decimals for…

A:

Q: What mass of NO2 would have the same number of moles of N with 0.402 g of porphyrin, C20H14N4?…

A:

Q: How many moles of silver atoms do you have if you have 7.78 × 10²¹ atoms of silver. (The mass of one…

A:

Q: How many moles of aluminum do 5.80×1024 aluminum atoms represent? Express your answer using three…

A: Number of Aluminum atom = 5.80 × 1024

Q: How many moles of sodium atoms do you have if you have 5.60 × 10²³ atoms of sodium. (The mass of one…

A: Given →5.60*1023 atoms of sodium→mass of one mole of sodium=22.99 gone mole sodium atoms mean…

Q: How many moles are in 130 gram of N?

A: Given :-  Mass of N = 130 g  Atomic weight of N = 14.01 g.mol-1  To calculate :-  Number of moles of…

Q: Calculate the number of atoms in 16 g of Si-28. The isotope Si-28 has a mass of 27.977 amu. 0.57 mol…

A:

Q: Calculate the mass in grams of 8.35 × 1022 molecules of CBr4

A: We have given that, No.of molecules of CBr4 = 8.35 ×1022 we know that from avogardo's law 1 mole 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.