The density of an object is 7 g/mL and has a volume of 2mL, what is the mass of the object?

How many molecules of NaCl are in 58.5 g NaCl?

Inga [223]

Answer:

6.023*10 ²³ molecules

Explanation:

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

Hence ,

n = w / m

n = moles ,

w = given mass ,

m = molecular mass .

From the question ,

given mass of NaCl = w = 58.5 g

As we know the molecular mass of NaCl = m = 58.5 g/mol

Moles can be calculted from the above formula -

n = w / m = 58.5 g / 58.5 g/mol = 1 mol

Since , 1 mol has 6.023*10 ²³ particles ,

Therefore ,

1 mol of NaCl = 6.023*10 ²³ molecules

7 0

2 years ago

The table below describes the temperature of different colors of stars.

nydimaria [60]

Answer:

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Explanation:

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3 0

3 years ago

Consider a solution containing 0.100 M fluoride ions and 0.126 M hydrogen fluoride. The concentration of fluoride ions after the

Nataliya [291]

Answer: The concentration of fluoride ions after the addition of 9.00 mL of 0.0100 M HCl to 25.0 mL of this solution is 0.0709 M.

Explanation:

Given: Concentration of hydrogen fluoride = 0.126 M

Concentration of fluoride ions = 0.1 M

Volume of HCl = 9.0 mL

Concentration of HCl = 0.01 M

Volume of HCl = 25.0 mL

Moles of $F^{-}$ ions are calculated as follows.

$Moles of F^{-} = molarity \times volume\\= 0.1 M \times 0.025 L\\= 0.0025 mol$

Moles of HF are as follows.

$Moles of HF = Molarity \times Volume\\= 0.126 M \times 0.025 L\\= 0.00315 mol$

Moles of HCl are as follows.

$Moles of HCl = Molarity \times volume\\= 0.01 M \times 0.009 L\\= 0.00009 mol$

Now, reaction equation with initial and final moles will be as follows.

$H^{+} + F^{-} \rightarrow HF$

Initial: 0.00009 0.0025 0.00315

Equilibrium: (0.0025 - 0.00009) (0.00315 + 0.00009)

= 0.00241 = 0.00324

Total volume = (9.00 mL + 25.0 mL) = 34.0 mL = 0.034 L

Hence, concentration of fluoride ions is calculated as follows.

$Concentration = \frac{moles}{volume}\\= \frac{0.00241 mol}{0.034 L}\\= 0.0709 M$

Thus, we can conclude that concentration of fluoride ions after the addition of 9.00 mL of 0.0100 M HCl to 25.0 mL of this solution is 0.0709 M.

7 0

3 years ago

How To Calculate The Structure Ofan Element?

KATRIN_1 [288]

To calculate for the structure of an element, you need to have a solid analyzer such as an x ray diffractometer to determine the elements’ structure. It is hard to determine it without any help of instrument because of its size.

3 0

3 years ago

Which of the following is the best example of water changing from a liquid to a gas?

ycow [4]

Answer:

c

Explanation:

hope this helps! ^-^

3 0

3 years ago

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