Solution: How many moles are in 25 mg of O 2? (Atomic mass of O = 16.0...

Calculate the average mass, in grams, of an O2 molecule. a. 32.0 b. 2.00 c....

6.02 x 1021 molecules of an unknown substance X has a mass of 11.0 grams. What...

Calculate the number of nitrogen atoms in 240. g of ammonium nitrate. (A) 2.0...

32.0 grams of the element oxygen: (A) contain 6.02 x 1023 atoms of oxygen (B...

Calculate the number of moles in 55.0 g of magnesium hydroxide. (A) 0.943 mol...

What is the mass of 4.50 x 1022 atoms of magnesium, Mg? (A) 0.0748 g (B) 0.1...

Calcium fluoride is used to fluoridate drinking water. Calculate its molar mas...

6.02 x 10 21 molecules of an unknown substance X has a mass of 2.00 grams. Wha...

How many fluorine atoms are present in 19.75 g of the Freon C 2HBrClF3? (A) 1...

Calculate the mass in grams of 1.505 x 10 23 molecules of CH 4. (A) 4 g (B) ...

How many moles of water contain 2.22 x 10 24 molecules of water? (A) 3.69 mol...

Calculate the number of carbon atoms in 4.56 grams of ethanol (CH 3CH2OH). 1....

How many moles of lithium phosphate are in 85.7 g of this substance? 1. 0.306...

A quantity of N2 occupies 62.2 L at a particular temperature and pressure. Its...

What mass of aluminum bromide will contain 6.3 x 10  20 bromide ions ? a) 93 ...

How many xenon atoms are contained in 2.36 moles of xenon? ...

Calculate the molar mass for Mg(ClO4)2. A) 223.21 g/mol B) 123.76 g/mol C) ...

Phosphorus tribromide is a liquid with a density of 2.852 g/cm3.  A beaker con...

How many grams of gold contain 1.39 x 10 23 atoms of gold? a. 0.220 g b. 0.2...

Determine the number of moles of silicon in 5.00 mg Si. a. 1.78 x 10-4 mol b...

What is the average mass in grams of one atom of iron? a. 55.85 g b. 6.02 x ...

Which of the following samples contains the largest number of atoms? a. 1 g L...

How many atoms of carbon are there in 0.80 moles of C 6H4Cl2? a. 3.9 x 1024 ...

How many sodium atoms are in 6.0 g of Na 3N? a. 1.3 x 1023 atoms b. 3.6 x 10...

How many sulfur atoms are present in 256 mg of Al 2(S2O3)3? a. 3.95 x 1022 b...

How many bromide ions are in 0.55 g of iron(III) bromide? HINT: What does the...

What is the molecular weight of glucose, C6H12O6 ...

Of the following: one atom of uranium (U), one molecule of benzene (C6 H6), on...

How many moles are in 42.6 g of water? 1. 767 mol 2. 3.04 mol 3. 2.66 mol ...

Suppose we have 100 g of each of the following substances. Which sample contai...

Determine the volume of hexane that contains 5.33 x 10 22 molecules of hexane....

Phenylenediamine (pictured below) is mainly used as a component of engineering...

Phenylenediamine (pictured below) is mainly used as a component of engineering...

Stearic acid (C18H36O2) is a fatty acid found in beef and butter.  a) What is...

What is the identity of substance X if 0.380 mol of X weighs 17.5 g? A) NO2 ...

What is the molar mass of calcium permanganate? A) 199 g/mol B) 278 g/mol C...

How many moles of C3H8 contain 4.95 × 10 24 hydrogen atoms? A) 3.09 moles C3H...

How many moles of N2O3 contain 2.55 × 1024 oxygen atoms? A) 7.87 moles N2O3  ...

What is the mass of 9.44 × 10 24 molecules of NO2? The molar mass of NO2 is 46...

What is the mass (in kg) of 6.89 × 10 25 molecules of CO2? The molar mass of C...

How many  C2H4  molecules are contained in 45.8 mg of  C 2H4 ? The molar mass ...

How many N2O4 molecules are contained in 76.3 g N 2O4? The molar mass of N2O4 ...

Calculate the molar mass for Mg(ClO4)2. A) 247.52 g/mol B) 119.52 g/mol C) ...

Calculate the mass (in kg) of 4.87 x 10 25 atoms of Zn. A) 1.09 kg         B...

How many iron atoms are contained in 354 g of iron? A) 9.50 × 10 22 Fe atoms ...

If 4.05 x 1023 molecules of a substance have a mass of 86.2 g, what is the mol...

How many formula units are in 0.25 mole of Na 2O? A)  4.5 x 1023    B)  0.75...

How many moles of PBr3 are contained in 3.68 × 1025 bromine atoms? A) 61.1 mo...

What is the mass (in kg) of 6.89 × 10 25 molecules of CO2? The molar mass of C...

A 20.0 g sample of an element contains 4.95 x 1023 atoms. Identify the element...

What is the molar mass of aspartic acid, C 4O4H7N?  A) 43.03 g/mol B) 70.02 ...

How many moles of Ar are in 5.22 X 1022 atoms of this noble gas?   ...

What is the mass (grams) of 4.91 x 1021 Pt    atoms?    1 mol Pt = 195.08 g =...

Amavadin is a vanadium-containing compound found in three species of toxic mus...

What mass (in kg) does 0.0822 moles of lead (Pb) have? a. 0.397 kg b. 17.0 k...

The Freons are a class of compounds containing carbon, chlorine, and fluorine....

If 2.50 grams of an unknown compound contains 6.25 x 10 19 molecules, what is ...

Which of the following amounts have the  most molecules?  a) 15.0 g N2 b) 15...

Which of the following amounts would contain the  least atoms?  a) 10.0 g Sr ...

How many atoms of oxygen are there in 53.2 g Al 2(SO4)3?       a. 9.36 x 1022...

A 7.36-g sample of copper is contaminated with an additional 0.51 g of zinc. S...

How many moles of aluminum do 5.8 X 1024 aluminum atoms represent? ...

How many sulfur atoms are there in 3.8 mol of sulfur?  ...

In Section 2.9, it was stated that 1 mol of sand grains would cover the state ...

A 67.2 g sample of a gold and palladium alloy contains 2.49 x 10 23 atoms. Wha...

 A pure titanium cube has an edge length of 2.78 in. How many titanium atoms d...

Consider the stack of pennies in the previous problem. How much money (in doll...

A penny has a thickness of approximately 1.0 mm. If you stacked Avogadro's num...

An α particle,  4H2+, has a mass of 4.00151 amu. Find the value of its charge-...

Using scanning tunneling microscopy, scientists at IBM wrote the initials of t...

Calculate the average mass, in grams, of one platinum atom. ...

How many helium atoms are there in a helium blimp containing 536 kg of helium?...

Calculate the mass, in kg, of each sample. a. 7.55 x 1026 cadmium atoms b. 8...

What is the mass of 4.91 x 10 21 platinum atoms? ...

What is the mass, in grams, of each elemental sample? d. 1.3 mol W ...

What is the mass, in grams, of each elemental sample? c. 43.9 mol Xe ...

What is the mass, in grams, of each elemental sample? b. 0.0355 mol Ba ...

What is the mass, in grams, of each elemental sample? a. 2.3 x 10 –3 mol Sb ...

How many moles of sodium ions (Na +) are in 56.0 g of sodium phosphate (Na 3PO...

A 2.000 g sample of an unknown metal, M, was completely burned in excess O 2 t...

The number of atoms in 9.0 g of aluminum is the same as the number of atoms in...

What mass of carbon is present in 1.4 x 10 20 molecules of sucrose (C12H22O11)...

How many atoms are in 1.50 g of Al? a) 0.0556 b) 18.0 c) 3.35 x 1022 d) 2....

What mass of carbon is present in 0.500 mol of sucrose (C 12H22O11)? a) 60.0 ...

What mass of KClO3 will produce 48.0 g of oxygen gas, O2, if the decomposition...

A single molecule of a certain compound has a mass of 3.4 x 10 –22 g. Which va...

The number of atoms in 9.0 g of aluminum is the same as the number of atoms in...

A 3.41 x 10–6 g sample of a compound is known to contain 4.67 x 10 16 molecule...

A sample of a compound of xenon and fluorine contains molecules of a single ty...

What mass of the compound CrO3 (M = 100.0) contains 4.5 x 10 23 oxygen atoms? ...

If the mass of 2.51 x 10 -3 moles of compound A is 0.452 g, then what is the m...

How many sodium ions are contained in 99.6 mg of Na  2SO3 ? a) 1.05 X 1021 b...

How many iron atoms are contained in 354 g of iron? A) 2.62 × 1025 Fe atoms ...

How many Li atoms are contained in 97.9 g of Li? A) 5.90 × 1025 Li atoms B) ...

How many argon atoms are contained in 7.66 x 10 5 mol of argon? A) 4.61 × 102...

A 0.370 mol sample of a metal oxide (M 2O3) weighs 55.4 g. How many grams of M...

How many moles are in 26.7 grams of calcium nitrate? ...

What mass of carbon is present in 0.500 mol of sucrose (C12H22O11)? Molar mas...

A 1.000-g sample of a metal chloride, MCl 2, is dissolved in water and treated...

What is the atomic weight of an element, X, if 1.00g of X combines with 0.66 g...

What is A, if 64.0 g of A combines exactly with 142 g of Cl to give the compou...

What is the mass of one molecule of C8H18 (octane) in grams? A. 114 B. 1.9 x...

A compound has a formula of Y2O5. If 2.8 g of Y combines with 8.0 g of oxygen,...

Which of the following contains most hydrogen atoms in one gram of sample? A....

Which contains the largest number of carbon atoms? A. 0.10 mol of carbon atom...

How many moles are in 25 mg of O 2? (Atomic mass of O = 16.00 g/mol) A) 7.8 ×...

For a 90.0 g sample of glucose (C6H12O6) and a 171.1 g sample of sucrose (C12H...

We have a 1.3 x 1022 lead atoms and the same number of gold atoms. Which state...

The definition of the mole gives the relationship between: a. mass and the at...

Which statement below is true? a. The number of Ni atoms in 100 moles of Ni (...

One molecule of a compound weighs 2.03 x 10 -22 grams. Calculate the molar mas...

What is the molar mass of calcium phosphate, Ca 3(PO4)2? a. 87.05 g/mol b. 2...

How many moles of methanol are present in a 150.0 gram sample of methanol, CH3...

What mass (in kg) does 5.84 moles of Titanium (Ti) have? a. 0.352 kg b. 0.12...

If 2.50 grams of an unknown compound contains 6.25 x 1019 molecules, what is i...

Which of the following equals the number of hydrogen atoms in 40 grams of meth...

A single atom of a certain element has a mass of 3.352 x 10 -23 g. The element...

What is the mass of 1.3 x 10 13 moles of N2  in pg? a. 3.64 x 1014 b. 1.82 x...

What is the weight of O in 742.0 g of citronella oil that has the chemical for...

How many oxygen atoms are in a 125 mg sample of aspirin? The molar mass of asp...

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

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

Identify the correct statement regarding the mole. a) A mole of oxygen gas co...

A 1.000-g sample of a metal chloride, MCl 2, is dissolved in water and treated...

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