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Otrada [13]
4 years ago
9

If a sample of Fe2S3 contains 1.25x10ˣ15 iron atoms what is the mass in grams?

Chemistry
1 answer:
VMariaS [17]4 years ago
4 0

Answer:

mass = 0.00000043189g

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Why is it impossible to ever prove that a hypothesis is true?
maria [59]

Answer: A

Explanation:

Hypothesis have to be based on previous knowledge and have to be able to be tested but the problem is most hypothesis can’t be explained so it’s impossible to prove a hypothesis correct because science uses inductive reasoning

4 0
3 years ago
Give the name of the prefix and the quantity indicated by the following symbols that are used with SI base units.
Serhud [2]

Answer:

A. Centi, 10*-2

B. Deci, 0.1 or 10*-1

C. Giga, 10*9

D. Kilo, 10*3

E. Milli, 10*-3

F. Nano, 10*-9

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7 0
3 years ago
What is the energy for each question in Joules?
beks73 [17]

Answer:

Hello, there!

In order to solve problems like this DO PEMDAS

The Exponent:

So,  equals  4

Your problem becomes

Now we have to do what is in the  (

( the  is a  )

And

Problem becomes

So, this means that your answer would be  

Good luck on your assignment and enjoy your day!

kjExplanation:

7 0
2 years ago
Carbon -11 is a radioactive isotope of carbon. It’s half life is 20 minutes. What amount of the initial mass of 70.0g of C -11 a
dusya [7]

Answer:

4.38g

Explanation:

70.0/2 = 35g - 20 mins

35/2 = 17.5g - 40 mins

17.5/2 = 8.75g - 60 mins

8.75/2 = 4.375g - 80 mins

6 0
3 years ago
6) When a substance such as ice melts, its temperature increases. Describe what happens to the arrangement of the water molecule
Vinvika [58]
When temperature increases, there is more energy in a substance. For example, when water boils, more energy is produced. The arrangement of molecules in a solid are closer together and more packed, while the arrangement of molecules in a liquid are father apart and less packed.
4 0
3 years ago
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