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BigorU [14]
3 years ago
8

Please help i genuinely don’t know what to do

Chemistry
1 answer:
Maurinko [17]3 years ago
7 0
Like, the first one is
Na ->1
O ->1
H-> 1
Total->3
And so on
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What are the three conditions that can cause a chemicl reactions, give examples?<br> Help me plz
finlep [7]
Acid. that’s all i know.
7 0
3 years ago
If the heat of fusion for water is 334 j/g, how many Jules are needed to melt 45.0 g of ice at 0.0°c?
finlep [7]

Given parameters:

Heat of fusion of water  = 334j/g

Mass of ice  = 45g

Temperature of ice =  0.0°c

Unknown:

Amount of heat needed to melt = ?

Solution:

This is simply a phase change and a latent heat is required in this process.

  To solve this problem; use the mathematical expression below;

             H  = mL

where m is the mass

            L is the heat of fusion of water;

              H  = 45 x 334  = 15030J

7 0
4 years ago
How many moles of oxygen will occupy a volume of 2.5 liters at 1.2 atm
Citrus2011 [14]

<u>We are given:</u><u>_______________________________________________</u>

Volume of Gas (V) = 2.5L

Pressure (P) = 1.2 atm

Temperature (T) = 25°C  OR 25+273 = 298 K

Universal Gravitational Constant (R) = 0.0821

<u>Solving for number of moles:</u><u>___________________________________</u>

From the Ideal Gas Equation,

PV = nRT

(1.2)(2.5) = n(0.0821)(298)           [plugging the given values]

n = [(1.2)(2.5)] / [0.0821*298]

n = 300 / [298*8.21]

n = 0.12 moles

Hence, there are 0.12 moles of Oxygen in 2.5L of 1.2 atm gas when the temperature is 25°C

7 0
3 years ago
Can someone explain to me what the element Americium is?
Andreyy89
It's a radioactive chemical element. It's symbol is AM and the atomic number is 95. It is a transuranic member of the actinide series, in the periodic table located under the lanthanide element europium, and thus by analogy was named after the Americas.
7 0
4 years ago
There are eight consitutional isomers with the molecular formula C4H11N.
Dmitriy789 [7]

Answer:

See figure 1

Explanation:

We have to remember that in the isomer structures we have to <u>change the structure</u> but we have to maintain the <u>same formula</u>, in this case C_4H_1_1N.

In the formula, we have 1 nitrogen atom. Therefore we will have as a main functional group the <u>amine group</u>.

In the amines, we have different types of amines. Depending on the number of carbons bonded to the "N" atom. In the <em>primary amines</em>, we have only 1 C-H. In the <em>secondary amines</em>, we have two C-N bonds and in the <em>tertiary amines</em>, we have three C-N bonds.

With this in mind, we can have:

-) <u>Primary amines:</u>

1) n-butyl amine

2) sec-butyl amine including 2 optical isomers

3) isobutyl amine

4) tert-butyl amine

-) <u>Secondary amines:</u>

5) N-methyl n-propyl amine

6) N-methyl isopropyl amine

7) N, N-diethyl amine

-) <u>Tertiary amines:</u>

8) N-ethyl N, N-dimethyl amine

See figure 1

I hope it helps!

8 0
4 years ago
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