Moles questions and answers pdf

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Moles questions and answers pdf

This equation shows how relative formula massnumber of moles and mass are related:. This can be rearranged to find the mass if the number of moles and molar mass its relative formula mass in grams are known. It can also be rearranged to find the molar mass if the mass and number of moles are known. The triangle diagram may help you with this.

Stoichiometry Basic Introduction, Mole to Mole, Grams to Grams, Mole Ratio Practice Problems

Calculate the number of moles of carbon dioxide molecules in 22 g of CO 2. Calculate the mass of 2 mol of carbon dioxide CO 2. What is the relative formula mass of carbon dioxide? You can calculate the mass of a product or reactant using the idea of moles, a balanced equation and relevant A r values.

Sulfuric acid and sodium hydroxide react together to make sodium sulfate and water:. Calculate the mass of sodium sulfate made when 20 g of sodium hydroxide reacts with excess sulfuric acid.

The example above could also be tackled like this:. Mole calculations This equation shows how relative formula massnumber of moles and mass are related: curriculum-key-fact.Calculation of Equivalent Weight.

O Levels Chemistry Questions: Mole Concepts and Chemical Calculations

Atoms and molecules are too small to count. A mole symbol mol is defined as the amount of substance that contains as many atoms, molecules, ions, electrons or any other elementary entities as there are carbon atoms in exactly 12 gm of. One atomic mass unit amu. The number of moles of a substance can be calculated by various means depending on data available, as follows. Number of moles of molecules.

moles questions and answers pdf

Number of moles of atoms. Number of moles of particles e. Refer to the following video for mole concept. Mass of one atom of silver. Thus, 6. Now g of cane sugar contain 6. Equivalent weight is a relative quantity so it is unit less.

Titration is a procedure of determining the concentration of unknown solution with the help of solution of known concentration. In this procedure of determining the concentration of solution A by adding carefully measured volumes of a solution of known concentration B until the reaction of A with B is just complete. The reactant which is totally consumed during the course of reaction and when it is consumed reaction stops. The concept of limiting reactant is applicable to reaction other than monomolecular i.

For example.

moles questions and answers pdf

These is no limiting reactant. To determine the limiting reagent amount of all reactants and mole ratio of reactants must be known. If the ratio of moles of reactant A with respect to reactant B is greater than the ratio of the moles of A to moles of B for a balanced chemical equation then B is the limiting reactant.

All other terms like left unused mass of other reactant, amount of formed product can be known stoichiometrically by knowing the amount of limiting reactant. DearPreparing for entrance exams? Register yourself for the free demo class from askiitians.

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Studying in Grade 6th to 12th? Course Features. Physical Chemistry. Our IITian faculty will contact you in 1 working day. FB Connect. Ask Experts. Have any Question? Select Grade 6 7 8 9 10 11 12 12th pass.Answer the following to the best of your ability.

Questions left blank are not counted against you. A new page will appear showing your correct and incorrect responses. If you wish, you may return to the test and attempt to improve your score. If you are stumped, answers to numeric problems can be found by clicking on "Show Solution" to the right of the question.

Do NOT type units into the answer boxes, type only the numeric values. Do NOT use commas when entering large numbers. Enter scientific notation into answer boxes in the following format: 4. Answer all non-integer questions to at least 3 significant figures. What is the number of moles of each substance in the following compounds?

How many moles of O are present in 5 moles of C 12 H 22 O 11? How many moles of O are present in 4 moles of Ca 3 PO 4 2? To place scientific notation into the boxes, use the following format: 4. If large or small numbers are required, use scientific notation. To place scientific notation into the boxes, use the following format: 3. Find the moles of O 2 in a sample with O atoms. Find the g of FeO in a sample with 6.

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Find the moles of Be in a sample with 7. Find the grams of S -2 in a sample with 9.

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What is the mass of naturally occurring Li? The masses and relative abundances of the isotopes of Boron are: 10 B What is the mass of naturally occurring B? The masses and relative abundances of the isotopes of Sulfur are: 32 S What is the mass of naturally occurring S? How many moles of Iron Fe are present in a sample containing 4.

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How many grams of Nitrogen are required to react with g of Oxygen to form the same compound or, to combine in definite proportions? The results are found in the table below.

Which two experiments demonstrate the law of definite proportions? How many moles of water are present in each mole of the hydrated compound?Recently, we have seen more students asking us to discuss more in this chemistry blogsite.

Question 1: A mixture of 8g of hydrogen gas and 8g of oxygen gas is burnt and the rxn is represented by the equation below. What is the mass of water formed? What is the relative atomic mass of E?

Question 4: How many chloride ions are in contact with each sodium ion in a crystal lattice of sodium chloride? Brother you are correct about your last answer but your answer about the sodium sulphate is wrong.

Because it is an neutral salt. For 3— Sodium Sulphate is neutral not acidic. But what is pH? For 4— Please look at it in a 3 dimension manner. Now we knw tat Oxygen is the limiting reactant, therefore, we can say that Moles of water is 0.

Sodium Sulphate is a salt, formed by Sodium and Sulphuric Acid. It is an acidic salt, as sodium sulphate is Na2SO4. It shall the same for chloride as well. In other words, conc. In reality, it is the H2O molecules that undergo electrolysis first, thus forming the ions.

There should be 6 of the other ions next to it.This is a collection of chemistry worksheets in pdf format.

The answers to the questions are available on separate worksheets so you can fill them out and then check your work.

Please feel free to download these to your computer, print them, and use them as hand-outs. Also available is a PDF of a pie chart of the elemental composition of the human body. Share Flipboard Email. Anne Marie Helmenstine, Ph. Chemistry Expert. Helmenstine holds a Ph. She has taught science courses at the high school, college, and graduate levels.

Facebook Facebook Twitter Twitter. Here are some printable periodic tables to help you out, also in pdf format. Color Printable Periodic Table - Pretty much everything you need that can fit on a page and still be readable. Color table with atomic numbers, element symbols, element names, atomic weights, periods, and groups.

Electron Configuration Periodic Table - Periodic table that lists the electron configurations for each element. Color Printable Periodic Table - Color table with atomic numbers, element symbols, atomic weights, periods, and groups.

This is a flow chart of the steps of the scientific method, available as a PDF file:. Scientific Method PDF.Question 1. Calculate the mass of 6. Solution — No. Question 6. An atom of some element X weighs 6. Calculate the number of gram-atoms in 40 kg of it. Question 7. Total no. Question 8. Calculate the volume occupied by 1 mole atom of i monoatomic gas, and ii diatomic gas at NTP. Solution — 1 mole atom of monoatomic gas occupies Question Solution — 6.

Calculate the number of atoms in 5.


In monoatomic gases, No. In diatomic gases, No.

moles questions and answers pdf

Calculate the number of sulphate SO 4 2- ions in mL of 0. Calculate the standard molar volume of oxygen gas. Calculate the mass of 1 mole He gas. The density of He gas at NTP is 0. A metal M of atomic mass Calculate the apparent volume occupied by one atom of the metal. Calculate the number of oxygen atoms and its mass in 50 g of CaCO 3. Equal masses of oxygen, hydrogen and methane are taken in a container in identical conditions. Find the ratio of the volumes of the gases.

Let X g of each gas is taken. The atomic masses of two elements A and B are 20 and 40 respectively.

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Oxygen is present in a 1-liter flask at a pressure of 7. Calculate the number of oxygen molecules in the flask. Calculate approximately the diameter of an atom of mercury, assuming that each atom is occupying a cube of edge length equal to the diameter of the mercury atom.

The density of mercury is The density of a particular crystal of LiF is 2. From these data calculate the apparent Avogadro constant.Search this site.

Periodic Table.

Converting moles and mass

Nutshell Revision Topic 1 - States of Matter. Topic 2 - Acids, Alkalis and Salts. Topic 3 - Atomic Structure. Topic 4 - Ionic Compounds. Topic 5 - Covalent Substances. Topic 6 - Oxygen and Oxides.

Topic 7 - Group 1 elements. Topic 8 - Group 7. Topic 9 - Hydrogen and Water. Year 9 - Revision Checklist. Year 9 Prep Booklet. Topic 01 - The Periodic Table. Topic 02 - Moles. Topic 04 - Empirical Formulae and Percentage Yield. Topic 05 - Energetics.

moles questions and answers pdf

Topic 06 - Rates of reaction. Topic 07 - Equilibria. Topic 08 - The industrial manufacture of chemicals.


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