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4 years ago

What is atomic and mass number

1 answer:

5 0

The Atomic Mass Number is the number underneath the Element symbol and it is the atomic mass of the element. You can easily find the atomic mass(or get a very close number to it) by adding the protons and neutrons together. If there are 2 protons and 2 neutrons, the atomic mass would be 4.

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Draw the aromatic compound toluene (methylbenzene). show all hydrogen atoms, including those on the ring.

Otrada [13]

Aromatic compound has continuous cyclic structure with( 4n+2)π electrons (Huckels rule), where n = 0,1,2…

Here number of pi electron are 6, where 4 from two double bond and 2 from nitrogen non-bonding electrons, hence it has total 6 pi electrons, therefore

6= ( 4n+2)π

4 = 4n

n =1

Hence it is an aromatic compound

7 0

4 years ago

A laboratory procedure calls for making 590.0 mL of a 1.1 M KNO3 solution. How much KNO3 in grams is needed?

AveGali [126]

590 mL = 590 cm³= 0,59 dm³

C = n/V
n = 1,1M × 0,59 dm³
n = 0,649 mol
_____________________________

M KNO₃ = 39g+14g+16g×3 = 101 g/mol

1 mole -------- 101g
0,649 --------- X
X = 101×0,649
X = 65,549g KNO₃

:)

8 0

3 years ago

Which organ in frog function similar to the function of lungs in a bird ?

34kurt

Answer:

Explanation:

FROGS BREATHE THROUGH SKIN IN WATER AND THROUGH LUNGS ON LAND.

I HOPE IT WILL HELP YOU.

Hope this will help you and please mark as brainlist answer

3 0

3 years ago

Maya, a student, performs a titration. She completes the following steps as part of her titration procedure. 1. She cleans and r

Salsk061 [2.6K]

Answer is: No, because she did not stop adding base once the color changed.
The endpoint is the point at which the indicator changes colour in a colourimetric titration and that is point when titration must stop or results are going to be wrong, because the equivalence point of titration is not measured right.

6 0

3 years ago

3. Given the following equation:

miskamm [114]

Answer:

4.767 grams of KCl are produced from 2.50 g of K and excess Cl2

Explanation:

The balanced equation is

2 K+ Cl2 --->2 KCI

Here the limiting agent is K. Hence, the amount of KCl will be calculated as per the mass of 2.50 gram of K

Mass of one atom/mole of potassium is 39.098 grams

Number of moles is 2.5 grams = $\frac{2.5}{39.098} = 0.064$

So, 2 moles of K produces 2 moles of KCL

0.064 moles of K will produces 0.064 moles of KCl

Mass of one molecule of KCl is 74.5513 g/mol

Mass of 0.064 moles of KCl is 4.767 grams

4 0

3 years ago