If there are 7.28 x 1022 molecules in a sample of CH4, what is the mass of this sample in grams? O A. 0.035 g о в. 2.05 g C. 0.0075 g O D. 1.94 g

Q: How many molecules (units) are in 3.50 moles of H2SO4 ? Information that may be useful: H: mass…

A: From given  1 mole of H2SO4 contain avogadro number of molecules Then 3.50 mole of H2SO4 will have…

Q: 16. How many grams of water (18.02 g/mol) would contain 5.64 x 1024 hydrogen atoms? c. 84.4 g d.…

A: Given, Number of H atoms = 5.64*1024 atoms

Q: 13. How many oxygen atoms are in 225 g of O2? a. 4.23 x 1024 b. 6.84 x 1024 c. 8.47 x 1024 d. 1.69 x…

A: Number of Atoms of Oxygen can be calculated as -

Q: Example How many molecules of O, are present in 6.25 moles? (why is this a molecule and not an…

A:

Q: What is the mass of 2 moles of NH3? (Hint: 1 molecule of NH3 has a mass of 17 amu) * O 17 amu O 17 g…

A:

Q: ?How many atoms of hydrogen are present in 2.62 g of water 1023 7.83 .A 1022 8.76.B 1023 · 1.75.C O…

A: Number of hydrogen atom can be calculated by the help of number of moles. Mole is a counting unit…

Q: A compound was analyzed and the following results were obtained: • Molar mass: 270.4 g/mole • Mass…

A: The chemical formula of an unknown compound is determined by the percent by mass of the elements…

Q: Two moles of (NH4)2Fe(SO4)2-6H2O contains moles of sulfur atoms. O a. 2 O b.4 O.1 O d. 6 O e. 8

A: The moles of NH42FeSO42.6H2O is = 2 moles The moles of sulfur atom is =?

Q: Determine the number of atoms in 39.0 grams of calcium, Ca. (The mass of one mole of calcium is…

A: Mass of calcium = 39.0 grams Mass of 1 mol of calcium = 40.08 g. Number of atoms = ?

Q: [References] A1.782-g sample of coal contains 1.584 g C. Calculate the mass percentage of C in the…

A: Given data, Mass of coal sample = 1.782 g Mass of carbon = 1.584 g Mass percentage can be calculated…

Q: (Calculate the number of grams in one mole of CaS04.7H20, (Ca = 40, S=32, 0=16, H=1 .A g/mol 136 .B…

A:

Q: How many moles of gold are present in a sample containing 7.50 x 1024 atoms of gold?

A: Given- Number of atoms of gold = 7.50 ×1024 atom

Q: 23. How many oxygen atoms are in 1.50 mol of SO3? a. 7.71 x 1021 atoms b. 1.12 x 1022 atoms c. 3.01…

A: 1- First we will determine the moles of oxygen in SO3 : 1mol of SO3 have = 3mol of oxygen atom…

Q: Researchers obtained the following data from experiments to find the molecular formula of…

A: In order to find the formula of benzocaine we first write down the given data: Mass of the sample=…

Q: One mole of oxygen molecule (02) contains how many atoms of oxygen? a. 6.022 × 1023 O b. 1,6021 ×…

A: We have to tell the no. Of oxygen atom in 1 mole

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: Determine the mass in grams of 2.31 × 10²¹ atoms of chromium. (The mass of one mole of chromium is…

A: The relation between mass and number of atoms:                                    Mass(g)molar…

Q: How many particles are contained in 5.43 moles of carbon? * Type in answers without units, using…

A: Given data: Moles of Carbon=5.43 moles. To find: The number of particles.

Q: For a sample of Carbon that contains 2.41 x 1022 atoms, calculate: • number of moles of carbon in…

A: Introduction: Mole is the amount of substance that contains 6.022×1023 respective particles of that…

Q: One mole of oxygen molecule (O2) contains how many atoms of oxygen? O a. 6.022 x 1023 O b. 6.022 x…

A: Applying concept of moles and avogadro number.

Q: What mass of Al contains the same mumber of atoms as 3,.0g Pb a 23 g 6.0.014 g c 3.0 g d.0.39 g e…

A: Given : Mass of Pb = 3.0 g Since number of atoms of any element is given by, => Number of atoms =…

Q: Find the mass of 8.68 x 1032 molecules of sodium carbonate.

A:

Q: What is the mass of magnesium (24.305 g/mol) present in 0.3621 g Mg3N2 (100.949 g/mol)? 0.1744 g…

A: Given that:  Mass of Mg3N2 = 0.3621g  Molar mass of Mg3N2 = 100.949 g/mol Moles of Mg3N2 = given…

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: Consider Cl2+F2=CLF3 (ΔH°f = -164.65 kJ/mol) . 1. If 42 g of F2 is combined with 142 g of Cl2, how…

A: Balanced chemical equation: Cl2  +   3F2  ------>   2ClF3 Number of moles = Mass/molar mass

Q: A compound of hydrogen and carbon is 92.3% carbon, If 40 g of hydrogen is reacted with 135 g of…

A: Molecular mass is the sum of the masses of all the atoms in a given molecule. Percentage composition…

Q: Formaldehyde has the formula CH20. How many molecules are there in 0.11 g of formaldehyde. At. wt. C…

A: A multiple choice question based on mole concept, which is to be accomplished.

Q: Which sample will have the greatest mass? A. 2 mol of SO2 B. 1 mol of SO2 C. 1 mol of SO3 D. 2…

A:

Q: Determine the number of atoms in 81.0 grams of calcium, Ca. (The mass of one mole of calcium is…

A: Atomic weight of any element contains contain Avogadro number of atoms. Here mass of 1 mole of…

Q: The molar mass of an element is numerically equivalent to what? b. 1 mole a. 1 amu c. its atomic…

A: Molar mass is the sum of mass of all atoms and the unit of the molar mass is grams or g

Q: What is the mass of 3.01 × 1023 molecules of nitrogen, N2? (A) 7.00 g (B) 14.0 g (C) 28.0 g (D) 42.0…

A: Number of molecules of N2 = 3.01 × 1023 One mole contains Avogadro’s number of atoms. Therefore,…

Q: 4.00 moles of carbon have a mass of? a. 4.60 g b. 23.0 g c. 92.0 g d. 11.0 g e. 48.0 g

A: The molar mass of carbon=12 g/mol The given number of moles of Carbon=4.0 mol

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: How many chlorine atoms are in 12.2 g of CCl4?(a) 4.77 * 1022(b) 7.34 * 1024(c) 1.91 * 1023(d) 2.07…

A: Consider the 12.2 g of CCI4 Calculate the molar mass of CCI4 as follows: Molar mass = Atomic mass of…

Q: 5) 25 grams of PbSO4 is equivalent to how many moles? a) 0.0824 b) 1.21 c) 1.56 d) 1.98

A: Given data: Grams of PbSO4= 25 g. To find: The number of moles of PbSO4.

Q: Determine the number of atoms in 15.0 grams of calcium, Ca. (The mass of one mole of calcium is…

A: one mole of any species contains one avagadro number of atoms

Q: How many moles of Pb are in 4.71 x 1021 Pb atoms? O 2.84 x 1045 6.022 x 1023 207.2 none of the above…

A:

Q: 1. How many ATOMS of nitrogen are present in 4.59 moles of nitrogen dioxide ? atoms of nitrogen. 2.…

A: Nitrogen Dioxide = NO2  Moles of NO2 = 4.59 Number of Molecules of NO2 = Moles × 6.022 × 1023 = 4.59…

Q: Determine the number of atoms in 27.0 grams of bromine, Br. (The mass of one mole of bromine is…

A: Given : mass of 1 mole of bromine i.e Br = 79.90 g And mass of Br = 27.0 g

Q: (3.8: Similar to For More Practice 3.13) Determine the mass of a sample of carbon monoxide…

A:

Q: How many grams of BrBr are in 305 g CaBr2? mass:

A:

Q: Naturally occurring chlorine that is put in pools is 75.53 percent 35Cl (mass = 34.969 amu) and…

A: Given : There are total 2 naturally occurring isotopes of chlorine Mass of isotope 1 i.e 35Cl =…

Q: 1. How many ATOMS of silicon are present in 2.01 moles of silicon dioxide ? atoms of silicon. 2. How…

A: 1) Given data,  Moles of silicon dioxide (SiO2) = 2.01 mol

Q: What is the mass of 4.9 moles of N2O5?   a.   52.92g   b.   5.292g   c.   0.5292g…

A: We have given the moles of N2O5 = 4.9 mole

Q: A sample of terbium contains 3.01×1025 atoms. What is the total mass of this sample?The molar mass…

A: It is required to calculate the mass of 3.01 x 1025 atoms of terbium and the molar mass is 158.9…

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: 1. How many ATOMS of nitrogen are present in 3.74 moles of dinitrogen monoxide ?  atoms of nitrogen.…

A: 1 mol of Dinitrogen monoxide (N2O) has two moles of the Nitrogen atom and 1 mol of the Oxygen atom

Q: Determine the number of atoms in 23.0 grams of calcium, Ca. (The mass of one mole of calcium is…

A: Mass of Ca = 23 g  Molar mass of Ca = 40.08 g/mol

Q: 9. What is the mass of one-half mole of SO2? а. 8 g с. 24 g b. 12 g d. 32 g 10. How many grams are…

A: We know ; Mole of compound =  Mass of compound/ Molar mass of compound     1 mole of substance has…

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.