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3 years ago

Help me with 1 and 2

Chemistry

2 answers:

vladimir1956 [14]3 years ago

6 0

B and c are the correct answers

Andreyy893 years ago

3 0

Number 1 is a and number 2 is c

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The most concentrated solution is

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The most concentrated solution is b

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3 years ago

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What are the SI units of frequency?

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SI unit of frequency is Hertz(Hz)

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2 years ago

How many molecules are in 0.500 mole of N2O5?

Oksi-84 [34.3K]

Answer:

3,011.10e23.

Explanation:

3 0

2 years ago

Calcular la cantidad de NaOH necesaria para preparar medio litro de disolución 2,5 N. (Dato: peso molecular del NaOH = 40 g/mol)

kolbaska11 [484]

Answer:

The amount of NaOH required to prepare a solution of 2.5N NaOH.

The molecular mass of NaOH is 40.0g/mol.

Explanation:

Since,

NaOH has only one replaceable -OH group.

So, its acidity is one.

Hence,

The molecular mass of NaOH =its equivalent mass

Normality formula can be written as: $Normality=\frac{mass of solute NaOH}{its equivalent mass} * \frac{1}{volume of solution in L} \\$

Substitute the given values in this formula to get the mass of NaOH required.

$2.5N=\frac{mass of NaOH}{40g/mol} *\frac{1}{1L} \\mass of NaOH=2.5N*40gmol\\ = 100.0g$

Hence, the mass of NaOH required to prepare 2.5N and 1L. solution is 100g

8 0

2 years ago

In today's experiment, Solutions A and B are prepared as follows.

hram777 [196]

Answer:

D. 0.160

Explanation:

The solution A is obtained adding 2.0mL of a solution of bromocresol green, 5.0mL of 1.60M HAc and 2.0mL of a solution of KCl. The solution is diluted to 50mL

That means the HAc is diluted from 5.0mL to 50.0mL, that is:

50.0mL / 5.0mL = 10 times.

And the final concentration of HAc must be:

1.60M / 10 times =

0.160M

Right answer is:

3 0

2 years ago