Chemistry Chemistry Practice Problems Solutions Library

Mole Concept Solutions Library

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928 solutions

Mole Concept

Q. What is A, if 64.0 g of A combines exactly with 142 g of Cl to give the compound ACl 2? A. Br B. Mg C. Ca D. S E. Ba

Solved • Feb 12, 2016

Mole Concept

Q. What is the mass of one molecule of C8H18 (octane) in grams? A. 114 B. 1.9 x 10-22 C. 26 D. 6.9 x 10-21 E. 3.8 x 10-22

Solved • Feb 12, 2016

Mole Concept

Q. A compound has a formula of Y2O5. If 2.8 g of Y combines with 8.0 g of oxygen, what is the atomic weight of Y? A. 10 B. 12 C. 14 D. 16 E. 18

Solved • Feb 12, 2016

Mole Concept

Q. Which of the following contains most hydrogen atoms in one gram of sample? A. HClO4 B. HClO3 C. HClO2 D. HClO E. HCl

Solved • Feb 12, 2016

Mole Concept

Q. Which contains the largest number of carbon atoms? A. 0.10 mol of carbon atoms B. 1.2 g carbon C. 0.10 mol of CH4 D. 1.6 g of CH4 E. All are t...

Solved • Feb 12, 2016

Mole Concept

Q. A normal breath takes in about 1.0 L of air. Assuming that air has an average molar mass of 28.8 g/mol, and that its density is 0.97 g/L, how many ...

Solved • Feb 12, 2016

Mole Concept

Q. How many moles are in 25 mg of O 2? (Atomic mass of O = 16.00 g/mol) A) 7.8 ×10−4 B) 1.6 ×10−3 C) 0.40 D) 0.80 E) 800

Solved • Feb 12, 2016

Mole Concept

Q. For a 90.0 g sample of glucose (C6H12O6) and a 171.1 g sample of sucrose (C12H22O11), which statement is true? a. The sample of glucose has more m...

Solved • Feb 12, 2016

Mole Concept

Q. We have a 1.3 x 1022 lead atoms and the same number of gold atoms. Which statement is true regarding the mass of these samples? a. The mass of bot...

Solved • Feb 11, 2016

Mole Concept

Q. The definition of the mole gives the relationship between: a. mass and the atomic number. b. mass and number of atoms. c. mass and weight. d. t...

Solved • Feb 11, 2016

Mole Concept

Q. Which statement below is true?a. The number of Ni atoms in 100 moles of Ni (s) is the same as the number of Ni atoms in 100 moles of nickel (II) ch...

Solved • Feb 11, 2016

Mole Concept

Q. One molecule of a compound weighs 2.03 x 10 -22 grams. Calculate the molar mass of this molecule. a. 3.37 x 10-46 g/mol b. 3.36 x 10-23 g/mol c....

Solved • Feb 11, 2016

Mole Concept

Q. What is the molar mass of calcium phosphate, Ca 3(PO4)2? a. 87.05 g/mol b. 215.21 g/mol c. 278.18 g/mol d. 279.21 g/mol e. 310.18 g/mol

Solved • Feb 11, 2016

Mole Concept

Q. How many moles of methanol are present in a 150.0 gram sample of methanol, CH3OH? a. 7.776 x 10 -24 moles b. 4.681 moles c. 5.172 moles d. 4806...

Solved • Feb 11, 2016

Mole Concept

Q. What mass (in kg) does 5.84 moles of Titanium (Ti) have? a. 0.352 kg b. 0.122 kg c. 0.820 kg d. 0.280 kg e. 0.632 kg

Solved • Feb 11, 2016

Mole Concept

Q. If 2.50 grams of an unknown compound contains 6.25 x 1019 molecules, what is its molecular mass? 

Solved • Feb 11, 2016

Mole Concept

Q. Which of the following equals the number of hydrogen atoms in 40 grams of methane? a. 1.5 x 10 24 b. 2.4 x 10 24 c. 6.0 x 10 24 d. 6.022 x 10 23

Solved • Feb 11, 2016

Mole Concept

Q. A 14-g sample of which isotope will have the largest number of atoms? a. 13C b. 14C c. 13N d. 14N e. They would all have the same number of at...

Solved • Feb 11, 2016

Mole Concept

Q. What is the mass of one molecule of C 8H18 (octane) in grams?A. 114B. 1.9 x 10-22 C. 26D. 6.9 x 10-21 E. 3.8 x 10-22

Solved • Feb 8, 2016

Mole Concept

Q. A single atom of a certain element has a mass of 3.352 x 10 -23 g. The element is a. Ne b. Co c. Al d. Br e. Ti

Solved • Feb 5, 2016

Mole Concept

Q. What is the mass of 1.3 x 10 13 moles of N2  in pg? a. 3.64 x 1014 b. 1.82 x 1014 c. 1.82 x 1026 d. 3.64 x 1026 e. none of the given answers i...

Solved • Feb 5, 2016

Mole Concept

Q. What is the weight of O in 742.0 g of citronella oil that has the chemical formula C10H18O? a. 19.31 b. 18.52 c. 77.10 d. 115.5 e. 231.3

Solved • Feb 5, 2016

Mole Concept

Q. How many oxygen atoms are in a 125 mg sample of aspirin? The molar mass of aspirin is 180.15 g/mol and its molecular formula is C9H8O4.   a) 4.18...

Solved • Feb 4, 2016

Mole Concept

Q. How many Cl– ions are there in 15.6 g of MgCl 2?

Solved • Feb 4, 2016

Mole Concept

Q. How many Cl atoms are there in 27.3 grams of magnesium chloride?  

Solved • Feb 4, 2016

Mole Concept

Q. Identify the correct statement regarding the mole. a) A mole of oxygen gas contains 6.02 x 10 23 atoms. b) A mole of chlorine gas contains 2 x 6....

Solved • Feb 4, 2016

Mole Concept

Q. A 1.000-g sample of a metal chloride, MCl 2, is dissolved in water and treated with excess aqueous silver nitrate. After drying, the silver chlorid...

Solved • Feb 3, 2016

Mole Concept

Q. How many Cl atoms are there in 27.3 grams of magnesium chloride?

Solved • Jan 29, 2016