2. Atoms & Elements

If a sample of sodium chloride, NaCl, contains 73.1 kg, what is its number of formula units?

Calculate the number of oxygen atoms found in 783.9 g NiCl₂ • 6 H₂O.

If the density of water is 1.00 g/mL at 25°C, calculate the number of water molecules found in 1.50 x 10³ µL of water.

A cylindrical copper wire is used for the fences around a house. The copper wire has a diameter of 0.0750 in. How many copper atoms are found in 5.160 cm piece? The density of copper is 8.96 g/cm³. (V = π • r² • h)

Calculate the mass (in g) of each sample. a. 4.5 * 1025 O3 molecules

Determine the number of moles of hydrogen atoms in each sample. a. 0.0885 mol C4H10

Determine the number of moles of oxygen atoms in each sample. a. 4.88 mol H2O2 b. 2.15 mol N2O c. 0.0237 mol H2CO3 d. 24.1 mol CO2

The molar mass of HCl is 36.5 g/mol, and the average mass per HCl molecule is 36.5 u. Use the fact that 1 u = 1.6605 * 102 24g to calculate Avogadro's number.

How many molecules of ethanol (C2H5OH) (the alcohol in alcoholic beverages) are present in 145 mL of ethanol? The density of ethanol is 0.789 g/cm3.

How many atoms of oxygen are in the chemical formula 2Ca(ClO₂)₂? 2, 4, 6, or 8?

How many moles are there in 8.50 x 10^24 molecules of sodium sulfate, Na₂SO₃?

How many moles are in 2.5 g of N₂? 0.089 moles, 0.18 moles, 1.3 moles, 11 moles

What is the number of moles of CO₂ in a 220 gram sample of CO₂?

Which best compares 1 mol of sodium chloride to 1 mol of aluminum chloride?

How many moles are in 22 grams of argon?

What is the mass of 5 moles of Fe₂O₃?

Calculate the mass of 1.00×10²⁴ (a septillion) molecules of water.

How many molecules of N₂O₄ are in 76.3 g N₂O₄? The molar mass of N₂O₄ is 92.02 g/mol.

How many iron atoms are contained in 354 g of iron?

How many atoms are in 5.80 moles of He?

Number of o atoms in 6.25×10⁻³ mol Al(NO₃)₃

A 65-kg woman has 8.5 × 10⁻³ mol of hemoglobin in her blood. How many hemoglobin molecules are there in the woman's blood?

How many molecules are there in 230 grams of COCl₂

How many moles of atoms are in 9.00 g of ¹³C?

How many sodium ions are contained in 99.6 mg of Na₂SO₃

How many oxygen atoms are there in 1.25 g of sodium dichromate, Na₂Cr₂O₇?

How many H atoms are in 3.4 g of C₁₂H₂₂O₁₁?

Determine the number of moles of aluminum in 96.7 g of Al.

How many sulfur atoms are present in 3 moles of sulfur?

What is the mass in grams of 1.900×10²⁴ iodine atoms?

How many moles of Kr are contained in 398 mg of Kr?

How many molecules are in 3.6 grams of NaCl?

What is the mass in grams of 5.40 moles of lithium?

How many molecules of N₂O₄ are in 76.3 g N₂O₄?

How many moles of propylene (C₃H₆) are in 25.0 g?

How many moles of water, H₂O, contain 2.0×10²² molecules of water?

What mass (in mg) does 2.63 moles of Nickel have?

In a classroom, which comparison would a teacher most likely use to describe a mole?

Which statement best explains the purpose of using a mole in the measurement of matter?

Calculate the mass of 1.00×10²⁴ (a septillion) molecules of water.

How many iron atoms are contained in 354 g of iron?

How many molecules of N₂O₄ are in 76.3 g N₂O₄? The molar mass of N₂O₄ is 92.02 g/mol.

How many moles are in 22 grams of argon?

What is the mass of 5 moles of Fe₂O₃?

How many atoms are in a sample of 1.83 moles of potassium (K) atoms?

How many moles of aluminum are in 54.0 grams of aluminum (Al)?

How many moles of silicon (Si) atoms are equivalent to 65.8 g Si?

What is the mass of 1.7 × 10²³ atoms of zinc (Zn)?

How many sodium ions are contained in 99.6 mg of Na₂SO₃? The molar mass of Na₂SO₃ is 126.05 g/mol.

How many atoms are in a sample of 2.39 moles of neon (Ne) atoms?

The molar mass of nitrogen (N₂) is 28.02 g/mol. What is the mass, in grams, of 4.60 mol of N₂?

What is the mass to the nearest tenth of a gram of 3.50 moles of sodium metal?

For an atom to achieve maximum stability and become chemically inert, what must occur?

How many atoms of phosphorus are in 2.5 moles of Cu₃(PO₄)₂

How many moles of nickel (Ni) atoms are in 125 g Ni?

The mass of 0.550 mol of methanol, CH₃OH, is g (round to three significant figures).

How many moles of carbon (c) atoms are equivalent to 38.1 g C?

How many moles of chlorine (Cl) atoms are in a sample of 1.72 × 10²² atoms?

What is the mass of 3.8 × 10²⁴ atoms of argon (Ar)?

How many moles of cesium (Cs) atoms are in 675 g cCs?

How many atoms are in a sample of 68.7 grams copper (Cu)?

How many moles of silver (Ag) are equivalent to 68.3 g Ag?

How many moles of silver (Ag) are present in a sample of 3.8 × 10²⁴ atoms Ag?

In 1.75 mol of methane, CH₄, there are ______ molecules of methane.

How many moles of sodium (Na) do you have in a sample of 9.8 × 10²³ atoms Na?

What is the mass of one mole of beryllium if the atomic mass of beryllium is 9.01?

The molar mass of sodium is 22.99 g/mol and the molar mass of chlorine is 35.45 g/mol.

How many atoms of nitrogen are in the chemical formula Ni(NO₃)₂? 2 1 6 3

128.3 grams of methane (CH₄) is equal to how many moles of methane?

How many moles of iron are present in 3.15 × 10²⁴ atoms of iron?

The number of moles of hydrogen that is needed to produce 0.253 mol of water is

How many moles of carbon dioxide are there in 52.06 g of carbon dioxide?

How many oxygen atoms are contained in 2.74 g of Al₂(SO₄)₃?

Write a conversion factor for the relationship between grams and a mole of fe.

How many moles of pyridine (C₅H₅N) are contained in 3.13 g of pyridine?

There are __________ sulfur atoms in 25 molecules of C₄H₄S₂.

Calculate the mass of 25,000 molecules of nitrogen gas. (1 mole = 6.02 x 10²³ molecules)

How many moles of magnesium, mg, contain 9.31 × 10²² atoms of magnesium?

One atom of gold weighs 3.27 x 10^-13 ng. how many gold atoms are in 1.0 g of gold?

A rigid vessel contains 2.5 mol of H₂(g). How many grams of hydrogen are in the vessel?

How many atoms are present in 0.375 mol of palladium (Pd) atoms?

One mole of copper(II) sulfate, CuSO₄, contains ________ moles of O.

What is the mass in grams of 0.375 mol of the element potassium, K?