Question

The difference between the total number of hydrogen atoms in 78g of ethyne and 168g of baking soda is?

Answer 1

Answer:

Explanation:

In the particle model of matter, individual atoms can be bound tightly to other atoms to form

molecules. For example, water molecules are made up of two hydrogen atoms bound to one

oxygen atom. In symbols, this is written as H20, where the "H" represents a hydrogen atom, and

the "O" represents an oxygen atom. The small "2" after the "H" indicates that there are two

hydrogen atoms in the molecule. H20 is said to represent the chemical formula for water,

because it tells us exactly what atoms we would need if we wanted to make a molecule of water.

A chemical change (or a chemical reaction) is said to have occurred if the atoms making

up a molecule are rearranged. This can happen if a molecule loses some of its atoms, if some

atoms are added to a molecule, or if some of the atoms in a molecule get replaced by other

atoms.

An example of a chemical change (reaction) is the combining of two hydrogen molecules

with one oxygen molecule to form two water molecules. This is a chemical change, because the

molecules that you end up with are not the same as the ones with which you started. This change

(reaction) can be written symbolically in the following way:

An oxygen molecule is written as O2, indicating that oxygen molecules are made by binding

two oxygen atoms together. A hydrogen molecule is written as H2, indicating that this

molecule is made out of two hydrogen atoms. If you wish to indicate that you have two

hydrogen molecules, you would write 2H2, where the first "2" indicates that we are talking

about two molecules instead of one. The chemical reaction can then be written as

2H + O 2H O 22 2 →

In one of the previous activities in this course, a chemical reaction occurred when vinegar

was combined with baking soda. Several different types of molecules were made in that

reaction, including carbon dioxide. The activities presented here will allow you to investigate

that reaction in detail.

Answer 2

The difference between the number of moles is 3.57 moles, between hydrogen atoms of  168 gram of baking soda and 78 gram of ethyne.

Explanation:

Chemical formula of ethyne C2H2

number of moles of hydrogen atom is 2

78 grams of ethyne will have 26.04 grams/mole

number of moles= $\frac{mass}{atomic mass of one mole}$

     number of moles= $\frac{78}{28.04}$

         number of moles = 2.78 moles

1 mole of ethyne has 2 moles of hydrogen atom

2.78 moles of ethyne will have 'x' moles of hydrogen atom

$\frac{1}{2}$ = $\frac{2.78}{x}$

x = 2.78 x 2

x = 5.56, so 5.56 moles of hydrogen is present in ethyne.

Chemical formula of baking soda is NaHCO3

number of moles of hydrogen atom in NaHCO3 is 1

number of moles in 168 grams of baking soda. Molar mass is 84.07 grams/mole. Applying the formula,

number of moles= $\frac{mass}{atomic mass of one mole}$

number of moles = $\frac{168}{84.007}$

                             = 1.99 moles of baking soda

1 mole of NaHCO3 has 1 mole of hydrogen atom.

1.99 mole of NaHCO3 has x moles of hydrogen atom.

$\frac{1}{1}$ = $\frac{1.99}{x}$

1.99 moles of hydrogen is present in 168 grams of baking soda.

The difference between the number of moles is 3.57 moles between hydrogen atoms of baking soda and ethyne.

5.56-1.99

= 3.57 moles

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