An element has atomic number 10 and an atomic mass of 20. How many neutrons are in the atom of this element?

1 answer:

8 0

Atomic mass is found by adding the number of protons and neutrons together. The atomic number tells you how many protons an element has.
So since this element has 10 protons and an atomic mass of 20, there are 10 neutrons in this element.

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EXPERIMENT 1: How do you expect your coarse titration volume at the color change to compare to your fine titration volumes?

olchik [2.2K]

In the endpoint when the indicator changes color it gives the information that the acid is neutralized by the base.

<h3>What is Titration ? </h3>

Titration is also known as titrimetry is a technique where a solution of known concentration is used to calculate the concentration of the unknown solution. Titration is a laboratory technique.

<h3 /><h3>What is Endpoint ? </h3>

The point at which the indicator changes the color is known as Endpoint.

Thus from the above conclusion we can say that In the endpoint when the indicator changes color it gives the information that the acid is neutralized by the base.

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A reaction at evolves of dinitrogen monoxide gas. Calculate the volume of dinitrogen monoxide gas that is collected. You can ass

snow_tiger [21]

Answer:

The answer is " $V = 18.8\ L$ ".

Explanation:

Given:

$n= 0.788 \ mmol = 0.788 \ mol \ \text{(1 mmol is a thousandths of a mol)}\\\\R = 0.08206\ \frac{Latm}{Kmol}\\\\T = 17.0^{\circ}\ C = (17.0 + 273) \ K = 290 \ K\\\\ p=1\ atm\\\\V = ?$