# fundamentals of chemistry

## How to Calculate Moles

Mole in Chemistry In Science, the concept of a mole is usually used to measure the number of particles. Such as a molecule like Helium has an atomic weight of an atom is 4.002602 and replacing with a complex molecule like sucrose (C12H22O11) has an atomic weight of 342.30 so here the value of a …

## Define Gram Atomic Mass,Gram Formula Mass,Gram Molecular Mass

Gram Atomic Mass,Gram Formula Mass,Gram Molecular Mass Gram Atomic Mass Gram atomic mass is the term used to describe an element’s atomic weight when stated in grams. An element’s molar mass is defined as the mass of one mole in grams. Gram Atomic Mass Example Helium, for instance, has a gram atomic mass of 4 …

## How do you calculate the formula mass of NaCl and the molecular mass of CH4?

How do you calculate the formula mass of NaCl and molecular mass of CH4? Formula mass Definition The term “FORMULA MASS” refers to the total atomic masses of the ions contained inside a formula unit of an ionic compound. NaCl Formula mass Calculating the formula mass of NaCl by taking the sum of atomic masses …

## Define Empirical Formula and Molecular Formula with Examples

Empirical formula and Molecular formula Empirical Formula The formula which shows the simplest whole number ratio of atoms of elements in a compound is called the empirical formula. Empirical Formula Example The actual formula for hydrogen peroxide is H2O2 which shows that there is one hydrogen atom for every oxygen atom. Therefore the simplest ratio …

## Formula Unit, Ion , Molecular ion and Free Radical

Formula Unit, Ion, Molecular ion and Free Radical Write a note on the following 1. Formula Unit  2. Ion 3. Molecular ion 4. Free Radical FORMULA UNIT The smallest repeating unit of an ionic compound which shows the simplest ratio between its ions is called the formula unit. EXAMPLE The simplest ratio between Mg and …

## Relative atomic mass, Atomic mass unit and Average atomic mass

Relative atomic mass, Atomic mass unit and Average atomic mass Q. Write a note on the following Relative atomic mass Atomic mass unit  Average atomic mass ANSWER RELATIVE ATOMIC MASS The mass of one atom of an element is compared with one-twelfth [1/12] the mass of one atom of carbon-12. Explanation The mass of one atom …

## Define element compound and mixture with examples

Define element, compound and mixture with examples. Element An element is a pure substance that cannot be broken down into smaller substances. Each element’s atoms include the same atoms, which have identical structural and chemical properties. There are 118 naturally occurring elements, of which 92 are found in nature and the remainder are created in …

## What is a Simple Definition of Chemistry?

What is a simple definition of Chemistry. Also briefly explain branches of chemistry. Chemistry Definition Branch of science that deals with the study of matter, changes in matter, and the laws and principles that govern these changes Explanation The origin of the term chemistry is the word KEEM. The same name was given to ancient …

## Chemistry Class 9 Chapter 1 Fundamentals of Chemistry Numericals

Chemistry Class 9 Chapter 1 Fundamentals of Chemistry Important Numericals 1. What is the mass of 5 moles of ice? SOLUTION Given no. of mole of ice =5 moles Molecular mass of ice (H2O)= (2×1)+(1×16)=2+16 Molecular mass of ice =18 amu Number of moles = Mass in gram ÷ Molecular mass Rearranging the formula Mass …