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3 years ago

Which of the following is a pure substance? A. Air B. carbon dioxide C. soda D. salt water

Chemistry

2 answers:

VLD [36.1K]3 years ago

6 0

Hey There,

The answer to your Problem is

B. Carbon Dioxide

If this Helps May I have Brainliest?

uysha [10]3 years ago

4 0

B- Carbon dioxide, every other option listed is composed of more than one thing.

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What is the Lewis dot structure for oxygen?

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2 years ago

A chemist prepares a solution of sodium carbonate by measuring out of sodium carbonate into a volumetric flask and filling the f

Vadim26 [7]

Answer:

The correct answer will be " $9.45\times 10^{-5} \ mol/L$ ".

Explanation:

We have:

Moles of solute (Na₂Co₃) = $18.9 \mu \ mol$

= $18.9\times 10^{-6}$

$1 \mu \ mol$ = $10^{-6} \ mol$

Now,

The volume of the solution will be:

⇒ $0.200 \ L$

∴ ${1 \ mL=0.001 \ L}$

The formula to find the concentration will be:

⇒ $Concentration = \frac{moles \ of \ solute \ (mol)}{Volume \ of \ solution \ (L)}$

On substituting the given values, we get

⇒ $=\frac{18.9\times 10^{-6}}{0.200}$

⇒ $=9.45\times 10^{-5} \ mol/L$

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2 years ago

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2 years ago

How many neutrons does element X have if its atomic number is 56 and its mass number is 161?

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