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beks73 [17]
3 years ago
13

10.0 g of Mg(NO3)2 = ____ moles

Chemistry
1 answer:
JulsSmile [24]3 years ago
6 0

Answer:

0.067424154568526 moles

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hi:) anyone able to explain no.2 of what happens to particles of a solid that is heated until it melts? I don’t understand it. T
Viefleur [7K]
In a solid the particles are all really close together and stuck like that. As the solid melts and becomes a liquid the particles spread out. A solid won’t easily change its shape because the particles are bound together but in a liquid the shape is more fluid, take water when you pour it into a container it will change to fit the shape of a container this is because the particles aren’t as close and can move around. The particles of a solid change when it melts because it is changing states to a liquid.
8 0
3 years ago
Which force is a contact force
stiks02 [169]

Answer:

B. a bike braking

Explanation:

It involves friction! Hope this helps!

8 0
3 years ago
Read 2 more answers
Tellurium has eight isotopes: Te-120 (0.09%), Te-122 (2.46%), Te-123 (0.87%), Te-124 (4.61%), Te-125 (6.99%), Te-126 (18.71%), T
Elena-2011 [213]

The average atomic mass of tellurium, calculated from its eight isotopes (Te-120 (0.09%), Te-122 (2.46%), Te-123 (0.87%), Te-124 (4.61%), Te-125 (6.99%), Te-126 (18.71%), Te-128 (31.79%), and Te-130 (34.48%)) is 127.723 amu.

The average atomic mass of Te can be calculated as follows:

A = m_{Te-120}\%_{Te-120} + m_{Te-122}\%_{Te-122} + m_{Te-123}\%_{Te-123} + m_{Te-124}\%_{Te-124} + m_{Te-125}\%_{Te-125} + m_{Te-126}\%_{Te-126} + m_{Te-128}\%_{Te-128} + m_{Te-130}\%_{Te-130}

Where:

m: is the mass

%: is the abundance percent

Knowing all the masses and abundance values, we have:

A = 120*0.09\% + 122*2.46\% + 123*0.87\% + 124*4.61\% + 125*6.99\% + 126*18.71\% + 128*31.79\% + 130*34.48\%

To find the <u>average atomic mass</u> we need to change all the <u>percent values</u> to <u>decimal ones</u>

A = 120*9 \cdot 10^{-4} + 122*2.46 \cdot 10^{-2} + 123*8.7\cdot 10^{-3} + 124*4.61 \cdot 10^{-2} + 125*6.99\cdot 10^{-2} + 126*0.1871 + 128*0.3179 + 130*0.3448 = 127.723

Therefore, the average atomic mass of tellurium is 127.723 amu.

You can find more about average atomic mass here brainly.com/question/11096711?referrer=searchResults

I hope it helps you!

4 0
2 years ago
What is the molecular formula for CHON with a molar mass between 165-170
Drupady [299]
Mass for carbon = 12 Mass for hydrogen = 1 Mass for oxygen = 16 Mass for nitrogen = 14 12+1+14+16 = 33 165g / 33g = 5 times all the atoms by 5 C5H5O5N5
8 0
3 years ago
Determine the kinds of intermolecular forces that are present in each element or compound. Part A KrKr Check all that apply. Che
OLga [1]

Answer:

The kinds of intermolecular forces that are present in each element Kr-Kr.

Explanation:

Since Kr is an inert gas and in atomic form only it is highly stable.

So, Kr gas does not form molecules.

Between the atoms of inert gas, there exist London dispersion forces.

Hence, the intermolecular forces that are present between Kr-Kr atoms is London dispersion forces.

6 0
3 years ago
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