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3 years ago

Scientific Method – Design Your Own Experiment

Chemistry

1 answer:

Varvara68 [4.7K]3 years ago

6 0

Answer:

not a question but i need points yolo

Explanation:

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Calculate the mass of nickel metal which will react with 25mL of 0.15mol/L (

Fittoniya [83]

Answer:

0.110625 g of Ni

Explanation:

The first step in solving this problem is to put down the accurate chemical reaction equation.

Ni(s) + 2HCl(aq) ---> NiCl2(aq) + H2(g)

Secondly, we obtain the amount of HCl that reacted from the information provided.

Volume of HCl (V)= 25 ml

Concentration of HCl (C)= 0.15 mol/L

Then, to find the number of moles of HCl (n);

n= CV

Substitution values

n= 25/1000 × 0.15

n= 3.75 ×10^-3 moles

Mass of 3.75 ×10^-3 moles of HCl = number of moles × molar mass

Molar mass of HCl= 36.5 gmol-1

Therefore;

Mass of HCl = 3.75 ×10^-3 moles × 36.5 gmol-1

Mass of HCl= 0.136875 g of HCl

Thirdly we determine the mass of Ni reacted;

If 1 mole of Ni reacted with 2 moles of HCl according to the reaction equation

Then x moles of Ni reacts with 3.75 ×10^-3 moles of HCl

x= 1 × 3.75 ×10^-3 moles/ 2

x= 1.875 × 10^-3 moles of Ni

Mass of Ni= 1.875 × 10^-3 moles of Ni × 59 gmol-1

Mass of Ni= 0.110625 g of Ni

6 0

4 years ago

Calculate the weighted average

padilas [110]

Of what?
Attach a link or pic

3 0

3 years ago

A solution of sodium chloride in water has a vapor pressure of 19.6 torr at 25°C. What is the mole fraction of NaCl in this solu

Debora [2.8K]

Answer:

Mole fraction of Nacl is 0.173

Explanation:

we know that

$P_{sol}=\chi_{solvent}P^0_{solvent}$

where,

P sol - the vapor pressure of the solution

χ solvent - the mole fraction of the solvent

P ∘ solvent - the vapor pressure of the pure solvent

This means that in order to be able to calculate the mole fraction of sodium chloride, you need to know what the vapor pressure of pure water is at

25 ° C You can use an online calculator to find that the vapor pressure of pure water at 25 C is equal to about 23.8 torr .

$\chi_{water}= \frac{P{sol}}{P^0{water}}$

$\chi_{water}= \frac{19.6}{23.8}$

=0.827

Also we know that

$\chi_{water}+\chi_{Nacl}= 1$

This means that the mole fraction of sodium chloride is

χ_{Nacl}= 1-Χ_{water}

= 1-0.827 =0.173

3 0

3 years ago

What happens after coral is bleached?

maw [93]

Explanation:

The Answer Is

That The Coral Releases Its Colours And Becomes Pale White

5 0

3 years ago

A sealed, carbonated soda has a partial pressure of co2 of 4.0 atm at 25 degrees celsius. the concentration of co2 in the soda i

MArishka [77]

Answer:

1.0 × 10⁻⁵ mol/L

Explanation:

The concentration of a gas (C) in a liquid depends on its partial pressure (P), as expressed in Henry's law.

C = k × P

where,

k is the henry's law constant

When the partial pressure of the gas equilibrates at 3.0 × 10⁻⁴ atm, its concentration in the liquid is:

C = k × P

C = 3.4 × 10⁻² mol/L.atm × 3.0 × 10⁻⁴ atm

C = 1.0 × 10⁻⁵ mol/L

8 0

4 years ago