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3 years ago

Which substance contains only one kind of atom?

Chemistry

1 answer:

defon3 years ago

4 0

Answer:

Explanation:

Because ethanol consists C H and O formula C2H5OH

Formula of salt is NaCl

Formula of water is H2O

But fórmula of Aluminum is just Al

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4 C3H6 + 6 NO --> 4 C3H3N + 6 H2O + N2

emmasim [6.3K]

4 moles

Explanation:

Given parameters:

number of moles of reacting NO = 24moles

Equation of the reaction:

4C₃H₆ + 6NO ⇒ 4C₃H₃N + H₂O + N₂

Solution:

The moles is synonymous the quantity of matter that contains the avogadro's number of particles.

To solve this problem, we must ensure that the given equation is balanced by simply inspecting.

The equation is balanced by inspection.

From the balanced equation;

6 moles of NO reacted to produce 1 mole of nitrogen gas

24 moles of NO will therefore produce $\frac{24}{6}$ = 4 moles

learn more:

Number of moles brainly.com/question/1841136

#learnwithBrainly

5 0

4 years ago

The pH scale for acidity is defined by pH=−log10[H⁺] where [H⁺]is the concentration of hydrogen ions measured in moles per liter

masha68 [24]

Answer:

5.62 * 10^-13 moles per liter

Explanation:

The pH of a solution is the negative logarithm to base 10 of the concentration of hydrogen ions. What we simply do here is to input the information in the question into the equation:

pH=−log10[H⁺]

Here we know the pH but we do not know the concentration of the hydrogen ions.

12.25 = -log [H+]

log[H+] = -12.25

[H+] = 10^-12.25

[H+] = 5.62 * 10^-13 moles per liter

7 0

3 years ago

Which substance is not a solid at 20˚C and one atmosphere of pressure?

levacccp [35]

Choose A, Kr is noble gas

3 0

2 years ago

Can you look at the picture and tell me that answer ? Thank you

zepelin [54]

The answer is choice (1).

In case you're interested in the solution for future reference:

-- Density = (mass) / (volume)

-- The scale shows that the mass of the sample is 60 grams.

-- The graduated cylinder has 24 mL in it <em>without</em> the sample.
The graduated cylinder has 34 mL in it <em>with</em> the sample.
The volume of the sample is (34mL - 24mL) = 10 mL .

-- Density = mass/volume = 60g / 10mL = 6 g/mL

3 0

3 years ago

What is the molar concentration of 250. mL of aqueous solution containing 48.8 g of glucose, C6H12O6?

Nezavi [6.7K]

Answer:

1.08 mol/L

Explanation:

Molarity -

Molarity of a substance , is the number of moles present in a liter of solution .

$M=\frac{n}{V}$

M = molarity ( unit = mol / L or M )

V = volume of solution in liter ( unit = L ),

n = moles of solute ( unit = mol ),

Moles is denoted by given mass divided by the molecular mass ,

Hence ,

$n=\frac{w}{m}$

n = moles ,

w = given mass ,

m = molecular mass .

From the information of the question ,

V = 250 mL

Since ,

1 mL = 1/1000L

V = 0.250 L

w = 48.8 g

As we known , the mass of glucose ,

m = 180g/mol ,

From the above formula , moles is given as ,

$n=\frac{w}{m}$

substituting the corresponding values ,

n = 48.8g / 180g/mol

n = 0.27 mol

Now , the molarity can be calculated by using the above equation ,

M = n / V

substituting the corresponding values ,

M = 0.27 mol / 0.250 L

M = 1.08 mol/L

4 0

4 years ago