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3 years ago

During a titration a student found that 20.0cm3 of sodium carbonate solution

Chemistry

1 answer:

vlada-n [284]3 years ago

4 0

Answer: The concentration of $Na_2CO_3$ required is $0.349mol/dm^3$

Explanation:

According to the neutralization law,

$n_1M_1V_1=n_2M_2V_2$

where,

$n_1$ = basicity of $HNO_3$ = 1

$M_1$ = molarity of $HNO_3$ solution = $0.500 mol/dm^3$

$V_1$ = volume of $HNO_3$ solution = $27.9cm^3$

$n_2$ = acidity of $Na_2CO_3$ = 2

$M_1$ = molarity of $Na_2CO_3$ solution =?

$V_1$ = volume of $Na_2CO_3$ solution = $20.0cm^3$

Putting in the values we get:

$1\times 0.500\times 27.9=2\times M_2\times 20.0$

$M_2=0.349mol/dm^3$

Therefore, concentration of $Na_2CO_3$ required is $0.349mol/dm^3$

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What word or two-word phrase best describes the shape of the fluoroform molecule?

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Answer : The shape of the fluoroform molecule is Tetrahedral.

Explanation :

First we have to calculate the Hybridization of the molecule by formula,

$\text{Number of electrons} = \frac{1}{2}[V+H-C+A]$

where,

V = Number of valence shell electron in central atom

H = Number of neighboring monovalent atom

C = charge of cation

A = charge of anion

The central atom in this molecule is Carbon, it has 4 electrons in their valence shell.

The neighboring monovalent atoms are one Hydrogen atom and three Fluorine atom.

There is no charge of cation and anion on the given molecule.

V = 4

H = 1 Hydrogen atom + 3 fluorine atom = 4

C = 0

A = 0

By the above hybridization formula, we get

$\text{Number of electrons}= \frac{1}{2}[4+4-0+0]$ = 4

The number of electron pair = 4

The number of lone pair = 0

The number of electrons is 4, this means that the hybridization is $sp^{3}$ and the geometry of the molecule is Tetrahedral.

The geometry of the molecule is shown below.

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3 years ago

PLEASE HELP I REALLY CANT FAIL THIS. THIS DETERMINS IF I PASS MY GRADE. What are the most basic building blocks of all organisms

m_a_m_a [10]

Answer:

Cells are the basic building blocks of living things.

Explanation:

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Which chemical process generates the atp produced in glycolysis?.

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Substrate-level phosphorylation is a reaction that makes use of substrate to generate Adenosine triphosphate (ATP) which is a form of energy.

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Learn more on substrate level phosphorylation here,

brainly.com/question/7331523

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A compound is 40.0% C, 6.70% H, and 53.3% O by mass. Assume that we have a 100.-g sample of this compound. Part A What are the s

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1, 2, 1

You are calculating the empirical formula of this chemical compound, which is the question with moles, molar mass, and number of moles.

first you divide the mass of carbon by its molar mass(relative formula mass)because there is a formula about moles state: number of moles=mass/molar mass. So, 40/12 is about 3.3. Then, the RFM of H is 1, so the number of mole is 6.7/1=6.7. The RFM of O is 16, whihc means the molar mass od oxygen is 16g, so 53.3/16, which is about 3.3 too.

Next, you get the number of moles in order is; 3.3, 6.7, 3.3. Now we need to look at the ratio between these numbers. 3.3 and 3.3 has a common factor of 1, so the subscript of them are both 1. next use 6.7/3.3, and the greatest common factor is 2, so the answer is 1,2,1.

To solve this kind of questions, there are many steps:

Know what you are calculating about, it's about the empirical formula, so you need to find out the number of moles of each elements.

1) Find the RFM of the element, because that is the molar mass(mass of 1 mole) of this element.

2) number of moles= mass/molar mass. use this formula to help you get the number of moles of each element in this compound

3) look at the relationship between the number of moles of each elements. find out the ratio between them.

4)that 's the answer of this question.

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