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Whitepunk [10]
3 years ago
15

Earthquakes are vibrations of Earth's crust. Which of the following is used to

Chemistry
1 answer:
Likurg_2 [28]3 years ago
5 0
A barometer is the answer
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The density of a 0.75M NaOH solution is 1.1g/ml. Calculate the mass percent of NaOH in the solution
Slav-nsk [51]

Answer:

2.73%

Explanation:

Molarity of NaOH = 0.75 M

Density of solution = 1.1 g/mL

Mass percent of NaOH = ?

Solution:

Number of moles of NaOH = 0.75 mol    from 0.75 mol/L

Mass of NaOH = number of moles × molar mass

Mass of NaOH = 0.75 mol × 40 g/mol

Mass of NaOH =  30 g

Mass of solution:

d = m/v

1.1 g/ mL = m/ 1000 mL

m = 1100 g

Percentage of NaOH:

% NaOH = mass of solute / mass of solution × 100

% NaOH =  30 g/ 1100 g × 100

% NaOH = 2.73%

5 0
2 years ago
Determine the [OH-], pH, and pOH of a solution with a [H+] of 0.090 M at 25 °C. [OH-] = pH = pOH = 0 POH =
ValentinkaMS [17]

Answer : The concentration of OH^- ion, pH and pOH of solution is, 1.12\times 10^{-13}M, 1.05 and 12.95 respectively.

Explanation : Given,

Concentration of H^+ ion = 0.090 M

pH : It is defined as the negative logarithm of hydrogen ion or hydronium ion concentration.

The expression used for pH is:

pH=-\log [H^+]

First we have to calculate the pH.

pH=-\log [H^+]

pH=-\log (0.090)

pH=1.05

The pH of the solution is, 1.05

Now we have to calculate the pOH.

pH+pOH=14\\\\pOH=14-pH\\\\pOH=14-1.05=12.95

The pOH of the solution is, 12.95

Now we have to calculate the OH^- concentration.

pOH=-\log [OH^-]

12.95=-\log [OH^-]

[OH^-]=1.12\times 10^{-13}M

The OH^- concentration is, 1.12\times 10^{-13}M

5 0
2 years ago
Read 2 more answers
3C2H402 atoms in formula
Vanyuwa [196]
3( 2 carbons + 4 hydrogen's + 2 oxygens)

3*(8) = 24
4 0
3 years ago
PLEASE I NEED HELP ASAP
Murljashka [212]

Answer:

Because the density of water is one

4 0
3 years ago
If the temperature of the water were 0°C and the pressure was above 760 mm Hg, what phase would the water be in?
viva [34]
I would say the answer is gas.
4 0
2 years ago
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