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3 years ago

15

What is the standard state of oxygen?

2 answers:

Darina [25.2K]3 years ago

8 0

To oxygen atoms combined to form <span>O_2[/tex] so they share electrons. They are in gas forms</span>

Simora [160]3 years ago

4 0

O2 gas, where there are two Oxygen atoms which are covalently bonded together

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If 25.0 ml of seawater has a mass of 25.895 g and contains 1.295 g of solute, what is the mass/mass percent concentration of sol

Romashka-Z-Leto [24]

The % mass/mass concentration of solute in the seawater sample is calculated as below

% mass = mass of the solute /mass of the solvent(sea water) x100
mass of the solute =1.295 g
mass of the solvent(sea water_) = 25.895 g

there the % mass = 1.295/25.895 x100 = 5.001 %

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2 years ago

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andriy [413]

Answer:

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2 years ago

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What is the mass of KOH found in a 785 mL of a 1.43 M solution of KOH

My name is Ann [436]

Molarity is defined as the ratio of number of moles to the volume of solution in litres.

The mathematical expression is given as:

$Molarity = \frac{Number of moles}{volume of solution in litres}$

Here, molarity is equal to 1.43 M and volume is equal to 785 mL.

Convert mL into L

As, 1 mL = 0.001 L

Thus, volume = $785\times 0.001$ = 0.785 L

Rearrange the formula of molarity in terms of number of moles:

$Number of moles =molarity\times volume of solution in litres$

n = $1.43 M \times 0.785 L$

= 1.12255 mole

Now, Number of moles = $\frac{mass in g}{molar mass}$

Molar mass of potassium hydroxide = 56.10 g/mol

1.12255 mole = $\frac{mass in g}{56.10 g/mol}$

mass in g = $1.12255 mole\times 56.10 g/mol$

= 62.97 g

Hence, mass of $KOH$ = 62.97 g

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3 years ago

Why do elements have different<br> properties?

Ann [662]

I think because each element has its own number of protons and neutrons, giving it its own atomic number and mass (correct me if I’m wrong please)

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2 years ago

Non metal are usually poor conductor of hart and electricity . The are non -lustourous,non-sonours,non-malleable and are coloure

vekshin1

Check the solution in the attachment.

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2 years ago