Question bank: Number of Moles: Introduction

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Question 1:

Hard

When studying the composition of substances, it is common to come across calculations involving the amount of matter. In a chemistry experiment, a student needs to calculate the number of water molecules (H2O) present in a 10-liter bucket of water. Considering that the molar mass of water is approximately 18 grams per mole, determine the number of water molecules present in the bucket and explain the calculation process in detail, using the concept of moles and Avogadro's constant. Consider that the bucket of water is at normal temperature and pressure.

Number of Moles: Introduction

Contextualized Question

Question 2:

Easy

One of the main concepts in Chemistry, the number of moles, is essential to understand the quantity of substances and perform stoichiometric calculations. Consider that you have one mole of carbon (6.022 x 10^23 atoms), and you are challenged to build a perfect cube with sides measuring 1 cm using these carbon atoms. Based on this information and knowing that the molar mass of carbon is 12 g/mol, answer: (1) How many grams of carbon would be needed to build a cube with sides of 2 cm? (2) If a building cube measures 40 meters on each side and was built with carbon atoms, what would be the total mass of the building in kilograms?

Number of Moles: Introduction

Multidisciplinary Question

Question 3:

Easy

A student is studying the amount of matter in a laboratory and needs to calculate the number of molecules present in a sample of water. The water sample has a mass of 18 grams, which corresponds exactly to the molecular mass of a water molecule. Considering that a water molecule is formed by one oxygen atom and two hydrogen atoms, determine how many water molecules are present in this sample and explain the reasoning used to reach this answer.

Number of Moles: Introduction

Multidisciplinary Question

Question 4:

Easy

A chemist needs to prepare a hydrochloric acid (HCl) solution to conduct a series of experiments. He knows that the solution should have a concentration of 0.1 moles per liter. If he wants to prepare 2 liters of the solution, how many moles of HCl will he need for this preparation?

Number of Moles: Introduction

Contextualized Question

Question 5:

Easy

During a chemistry experiment, you observe the formation of acetylene (C2H2) from the reaction between calcium carbonate (CaCO3) and hydrochloric acid (HCl), according to the balanced chemical equation: CaCO3(s) + 2HCl(aq) -> CaCl2(aq) + CO2(g) + H2O(l). Starting with 2 moles of CaCO3 and an excess of HCl, the complete reaction generates 2 moles of CO2. Based on this data and considering that the quantities of materials are ideal and fully converted, answer the following items: (1) Determine the total number of CO2 molecules formed during the reaction. (2) Explain the importance of the concept of number of moles in practical terms and how it relates to the chemical composition of the substances involved.

Number of Moles: Introduction

Multidisciplinary Question

IARA TIP

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