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4 years ago

What is the difference between pure substance, element, and compund

1 answer:

8 0

Pure substance- a material that has constant composition. It has distinct chemical properties.
Element- a substance that cannot be broken down into any other substances.
Compound- substance made up of two or more different elements.

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A student needs to prepare 100. mL of 0.612 M Cu(NO3)2 solution. What mass, in grams, of copper(II) nitrate should the student u

Temka [501]

Answer: 11.5 grams

Explanation:

Molarity of a solution is defined as the number of moles of solute dissolved per Liter of the solution

$Molarity=\frac{n\times 1000}{V_s}$

where,

Morality = 0.612 M

n= moles of solute

$V_s$ = volume of solution in ml = 100 ml

Now put all the given values in the formula of molarity, we get

$0.612=\frac{n\times 1000}{100ml}$

$n=0.0612moles$

$Mass={\text {moles of solute }}{\times {\text {molar mass}}=0.0612moles\times 187.56g/mol=11.5g$

Therefore, the mass of copper (II)nitrate required is 11.5 grams

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3 years ago

Changes between a liquid and gas exsample

exis [7]

Here are some examples:-

Water → water vapour

bromine → bromine gas

6 0

3 years ago

Define duplet and octet??

Bogdan [553]

Answer:
duplet-A set of two things or people
Octet-A group of 8 things or people

5 0

3 years ago

Help, I need to convert 3.16 μm to inches!

irina1246 [14]

0.00011811023622 <span>i</span><span>nches</span>

7 0

4 years ago

Calculate the number of moles of NaOH contained in 250. mL of a 0.05M solution.

steposvetlana [31]

Answer:

0.0125mol

Explanation:

Molarity (M) = number of moles (n) ÷ volume (V)

n = Molarity × Volume

According to this question, a 0.05M solution contains 250 mL of NaOH. The volume in litres is as follows:

1000mL = 1L

250mL = 250/1000

= 0.250L

n = 0.05 × 0.250

n = 0.0125

The number of moles of NaOH is 0.0125mol.

3 0

3 years ago