Writing Formulas, Molecular Mass and Moles

A chemist wants to computationally predict the structure and stability of a novel polymorph of titanium dioxide ($TiO_2$) under high-pressure conditions. Which method would provide the most accurate and reliable results, balancing computational cost with the need to accurately describe the electronic structure and bonding environment of $TiO_2$?

A polymer chemist aims to synthesize a biodegradable polymer with precisely controlled molecular weight and narrow dispersity for biomedical applications. Which polymerization technique would be MOST suitable for achieving these goals, while also allowing for the incorporation of functional groups along the polymer backbone for targeted drug delivery?

How many atoms of each element are in a formula unit of Dinitrogen Tetroxide?

What distinguishes atomic mass, molecular mass, and formula mass from each other?

Calculate the formula mass of $2H_2O$

Define the term mole:

A sample consists of 0.25 mole of ammonia. How many ammonia molecules is this?

A sample consists of 0.88 mole of Carbon Dioxide. How many Carbon Dioxide molecules is this?

A sample consists of 1.5 mole of Tetraiodine Nonoxide. How many Tetraiodine Nonoxide molecules is this?

Calculate the molar mass of calcium fluoride ($CaF_2$)

You are carrying out a laboratory reaction that requires 0.0360 mole of barium chloride ($BaCl_2$). How many grams of compound do you measure out?

Determine the mass in grams of $3.2 × 10^{24}$ molecules of sulfur tetrafluoride

Determine the mass in grams of $4 × 10^{24}$ molecules of Carbon Dioxide?

What are the correct Formula Mass and Molar Mass units?

Under what circumstances is the subscript omitted from a chemical formula?

A chemist synthesizes a novel coordination complex where a transition metal is coordinated by a chiral ligand derived from a natural product. Spectroscopic analysis reveals a strong Cotton effect in the circular dichroism (CD) spectrum of the complex. What information does this Cotton effect provide about the stereochemistry and electronic structure of the complex?

What term is used to describe individual components such as atoms or molecules when converting between moles and the number of those components?

If you have 2.5 moles of a substance, how would you calculate the number of individual particles (atoms or molecules) using the straightforward method?

What does 6.02E23 represent on a scientific calculator?

A calculation yields a result of $4.789 \times 10^{25}$ particles, but the initial data has only two significant figures. What is the correct way to express the final answer?

What is the primary purpose of using a conversion factor when converting between moles and atoms (or molecules)?

Which conversion factor is correctly set up to convert from moles to number of atoms?

You have $1.2 \times 10^{25}$ molecules of a compound. Which calculation correctly converts this to moles using the conversion factor method?

What is the first step in converting from a given number of atoms to moles using the straightforward method?

If you calculate 3.14 moles from an atoms to moles conversion, but your initial number of atoms has only three significant figures, how should you report your final answer?

Which of the following represents the correct setup for converting $9.0 \times 10^{22}$ atoms to moles using the conversion factor method?

You have 1.0 mole of NaCl. How many individual ions (Na+ and Cl-) are present?

If a sample contains $1.8066 \times 10^{24}$ molecules of $H_2O$, how many moles of $H_2O$ are present?

You want to determine the number of moles in a sample containing $3.011 \times 10^{22}$ atoms of gold (Au). Which calculation is correct?

A compound contains $6.022 \times 10^{24}$ molecules. How many moles of the compound are present?

How many atoms are present in 0.5 moles of carbon?

You have 0.25 moles of $O_2$ gas. How many molecules of $O_2$ are present?

You are given a sample of iron (Fe) containing $1.8 \times 10^{24}$ atoms. How many moles of iron are present in the sample, rounded to two significant figures?

A chemist measures out 0.75 moles of glucose ($C_6H_{12}O_6$). How many molecules of glucose are present?

A reaction requires $2.4088 \times 10^{24}$ atoms of copper (Cu). How many moles of copper are needed for the reaction?

What conversion factor should be used to convert $1.5 \times 10^{25}$ atoms of helium to moles?

If a sample contains $9.033 \times 10^{23}$ molecules of water ($H_2O$), how many moles of water are present?

Which of the following correctly represents Avogadro's number?

To convert 3.0 moles of a substance to the number of molecules, which operation should you perform?

How many moles are there in $1.2044 \times 10^{24}$ atoms of iron?

Given that you have $3.011 \times 10^{23}$ molecules of $CO_2$, how many moles of $CO_2$ do you have?

If you have 2.0 moles of water, how many water molecules do you have?

If you start with $2.0 \times 10^{24}$ atoms of gold, how many moles of gold do you have? (Round to two significant figures.)

What is the number of carbon atoms in 0.75 moles of carbon?

How many moles are in a sample containing $1.5055 \times 10^{23}$ atoms of neon?

How many molecules are there in 2.5 moles of water?

If you have $7.2264 \times 10^{23}$ atoms of carbon, how many moles of carbon do you have?

What is the number of molecules in 0.3 moles of $CO_2$?

Converting $3.6132 \times 10^{24}$ molecules of water ($H_2O$) to moles, how many moles do you have?

If you have 4 moles of methane ($CH_4$), how many molecules of methane do you have?

A sample contains $2.4088 \times 10^{23}$ atoms of helium. How many moles of helium are present?

How many molecules are present in 1.25 moles of oxygen gas ($O_2$)?

What is the number of molecules in 3.5 moles of water?

How many moles are there in a sample containing $1.8066 \times 10^{23}$ atoms of iron?