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Murrr4er [49]
2 years ago
7

How many protons and neutrons are there in an atom of 3.K?

Chemistry
1 answer:
pickupchik [31]2 years ago
3 0

Answer:

A: 11 protons and 21 neutrons

Explanation:

Hopefully this helps!

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What is the density of an object if its mass is 10 g and a volume of 2 mL?
Lilit [14]

Hi there! Let's solve this problem shall we!

⠀Volume = 10g

      Mass = 2 mL

In this specific problem, they are asking us to find the <u><em>density </em></u>of the object. So,<u><em> using the information given to us</em></u> (volume and mass), let's solve the problem!

Now, if you remember, D = M ÷ V

So, let's fill in the blanks!

D = Our unknown value

M = 2mL

V = 10g

Here is the filled out formula:

D = M ÷ V

D = 2mL ÷ 10g

D = 5 g/mL

*Make sure you put the units for your final solution!*

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1 year ago
Write an algebraic expression to repro<br> 1.4 times a number, increased by 7
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A mixture of CuSO4 · 5H2O and MgSO4 · 7H2O is heated until all the water is lost. If 5.127 g of the mixture gives 2.817 g of the
Nadusha1986 [10]

Answer:

Let the mixture is X% by mass of CuSO

4

.5H

2

O and 100 - X % by mass of MgSO

4

.7H

2

O. 5.0 g of mixture will contain 0.05X g CuSO

4

.5H

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O and 5.0 - 0.05X g MgSO

4

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2

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The molar masses of CuSO

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.5H

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O and MgSO

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O are 249.7 g/mol and 246.5 g/mol respectively.

The number of moles of CuSO

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2

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249.7

0.05X

=2.00×10

−4

X moles.

Explanation:

Pls mark it as branliest answere thanks

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I have no idea what to do please help me quickly!
Irina18 [472]

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The farther away the planet the slower the revolution around the earth. the closer the faster.

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