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Julli [10]
3 years ago
6

The mass of a substance per unit volume

Chemistry
1 answer:
Wittaler [7]3 years ago
5 0
The mass of a substance per unit volume is the substance's density.

D = m/v.
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If the pH of a solution is 5, what is the pOH?
butalik [34]

Answer:

The answer is 9

Explanation:

To answer this question, we are using the formula

pH + pOH = 14

It's a constant formula

We've been given the pH to be 5

So therefore, inserting it into the above above

5+ pOH = 14

pOH = 14-5

= 9

pOH = 9

That's the final answer

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What are the uses of the metal Magnesium?​
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6 0
2 years ago
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How many moles of NaOH are present in 27.5 mL of 0.270 M NaOH?
Naddik [55]
The solution for the question above is:

C = 0.270 
<span>V = 0.0275L </span>
<span>n = ? </span>

<span>Use the molar formula which is: C = n/V </span>
<span>Re-arrange it to: n = CV </span>
<span>n = (0.270)*(0.0275) </span>
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<span>(more precise) n = 7.425 x 10^-3 mols
</span>
7.425 x 10^-3 mols is the answer.
8 0
3 years ago
The human eye contains a certain protein called rhodopsin that changes shape when it is exposed to light. When rhodopsin absorbs
grandymaker [24]
The human eye contains a molecule called 11-cis-retinal that changes conformation when struck with light of sufficient energy. The change in conformation triggers a series of events that results in an electrical signal being sent to the brain. The minimum energy required to change the conformation of 11-cis-retinal within the eye is about 164 {\rm kJ}/{\rm mol}.
6 0
3 years ago
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A sample of nitrogen gas has a volume of 478 cm3 and a pressure of 104.1 kPa. What volume would the gas occupy at 88.2 kPa if th
nadezda [96]

<span>1.    </span>To solve this we assume that the gas is an ideal gas. Then, we can use the ideal gas equation which is expressed as PV = nRT. At a constant temperature and number of moles of the gas the product of PV is equal to some constant. At another set of condition of temperature, the constant is still the same. Calculations are as follows:

P1V1 =P2V2

V2 = P1 x V1 / P2

 V2 = 104.1 x 478 / 88.2

<span> V2 =564.17 cm^3</span>

6 0
2 years ago
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