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3 years ago

6

How many molecules of ammonia are contained in 10.4 moles of ammonia, NH3?

1 answer:

seraphim [82]3 years ago

4 0

Avogadro's number represents the number of units in one mole of any substance. This has the value of 6.022 x 10^23 units / mole. This number can be used to convert the number of atoms or molecules into number of moles. We do as follows:

10 mol NH3 ( 6.022 x 10^23 molecules / 1 mol ) = 6.022x10^24 molecules NH3

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A student described two properties of a substance as shown. Properties of Substance Property Description C A known mass of the s

anzhelika [568]

Answer:

Both are physical properties. Both are chemical properties.

Explanation:

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~Zero~

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3 years ago

What are the benefits and dangers of the Iron element in our daily life?

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4 years ago

13 POINTS AND BRAINIEST!!!!

Nadusha1986 [10]

Answer:

30 moles of ethanol are needed to prepare a 25 m solution, using 1200 g of water

Explanation:

This a short problem of solutions:

Our solute is ethanol: C₂H₅OH

Our solvent is water-

25 m, is our solution's concentration. m means molality (moles of solute contained in 1kg of solvent).

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1200 g . 1kg / 1000g = 1.2 kg

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7 0

3 years ago

An acidic solution at 25°c will have a hydronium ion concentration ________ and a ph value ________.

lesantik [10]

The given question is incomplete. The complete question is:

An acidic solution at 25°C will have a hydronium ion concentration ________ and a pH value ________.

$[H_3O^+]$ > $1\times 10^{-7}$ M, pH < 7.00

$[H_3O^+]$ < $1\times 10^{-7}$ , pH < 7.00

$[H_3O^+]$ < $1\times 10^{-7}$ ,, pH > 7.00

$[H_3O^+]$ > $1\times 10^{-7}$ ,, pH > 7.00

Answer: $[H_3O^+]$ > $1\times 10^{-7}$ M, pH < 7.00

Explanation:

pH or pOH is the measure of acidity or alkalinity of a solution.

pH is calculated by taking negative logarithm of hydrogen ion concentration.

Acids have pH ranging from 1 to 6.9, bases have pH ranging from 7.1 to 14 and neutral solutions have pH equal to 7.

$pH=-\log [H_3O^+]$

$7=-log[H_3O^+]$

$[H_3O^+]=10^{-7}$

As pH of acids is less than 7, the hydronium ion concentration is greater than

Thus the correct option is $[H_3O^+]$ > $1\times 10^{-7}$ M, pH < 7.00

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4 years ago

Write the formula of the first 5 members in the series of alkynes

professor190 [17]

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3 years ago