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3 years ago

6

How many moles of KCl are in 2 L of 2.5 M KCl solution?

1 answer:

beks73 [17]3 years ago

3 0

2.5LX2 M=5 moles

As Molarity X Volume= Total Number of Moles

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It is device used to measure thee temperature of food/fish

solmaris [256]

I think it’s a carrot . pretty sure

7 0

3 years ago

How many daltons is in an ion with 15 protons, 16 neutrons and 17 electrons?

Vera_Pavlovna [14]

31
A dalton is the same as an atomic mass unit. And an atomic mass unit is approximately the mass of a nucleon (proton or neutron) such that the mass is 1 g/mol. So in this problem you have 15 protons and 16 neutrons, so the number of daltons is 15 + 16 = 31.

8 0

3 years ago

Wine goes bad soon after opening because the ethanol (CH,CH,OH) in it reacts with oxygen gas (0.) from the air to form water (11

daser333 [38]

<u>Answer:</u> The mass of water produced is 1.8 grams

<u>Explanation:</u>

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$ .....(1)

Given mass of ethanol = 4.59 g

Molar mass of ethanol = 46.07 g/mol

Putting values in equation 1, we get:

$\text{Moles of ethanol}=\frac{4.59g}{46.07g/mol}=0.0996mol$

The chemical equation for the reaction of ethanol with oxygen gas follows:

$CH_3CH_2OH+O_2\rightarrow CH_3COOH+H_2O$

By Stoichiometry of the reaction;

1 mole of ethanol produces 1 mole of water.

So, 0.0996 moles of ethanol will produce = $\frac{1}{1}\times 0.0996=0.0996mol$ of water.

Now, calculating the mass of water from equation 1, we get:

Molar mass of water = 18 g/mol

Moles of water = 0.0996 moles

Putting values in equation 1, we get:

$0.0996mol=\frac{\text{Mass of water}}{18g/mol}\\\\\text{Mass of water}=(0.0996mol\times 18g/mol)=1.8g$

Hence, the mass of water produced is 1.8 grams

5 0

3 years ago

What is the molecular weight for H3PO4

Dominik [7]

<span>H</span>₃<span>PO</span>₄<span> - Phosphoric Acid :

H</span>₃<span>PO</span>₄<span> = 1.0 * 3 + 31.0 + 16.0 * 4 = 98.0 g/mol

hope this helps!</span>

5 0

3 years ago

AysviL [449]

Answer:

Molar mass of acetic acid is 60 g/mol

Explanation:

Look at the formula:

CH₃COOH

We have:

2 moles of C → 12.011 amu . 2 = 24 g/mol
4 moles of H → 1.008 amu . 4 = 4 g/mol
2 moles of O → 15.999 amu . 2 = 32 g/mol

Let's sum the mass of each element

24 g/mol + 4 g/mol + 32 g/mol = 60 g/mol

8 0

3 years ago