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lorasvet [3.4K]
3 years ago
13

Suppose you have an atom composed of 19 protons, 20 neutrons and 19 electrons. what is the mass of this atom?

Chemistry
1 answer:
bazaltina [42]3 years ago
7 0
Mass = PROTONS + neutrons. So, 19 +20 = 39.
(Don't confuse yourself between electrons and protons when they are equal because it could be an ion)
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Define position and reference point in your own words. Dont copy and paste!
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Answer: The beginning stage you decide to depict the area, or position, of an object.

Explanation: starting point or position

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Hydrogen gas has a density of 0.090 g/L, and at normal pressure and -1.72 C one mole of it takes up 22.4 L. How would you calcul
BlackZzzverrR [31]

Answer:

n= \frac{m}{ \rho }* \frac{1 mol}{22.4 L}

Explanation:

Assuming that all caculations are at normal pressure and -1.72°C :

n= \frac{m}{ \rho }* \frac{1 mol}{22.4 L}

Where

n is the number of moles of hydrogen

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Phosphorous trichloride and phosphorous pentachloride equilibrate in the presence of molecular chlorine according to the reactio
umka21 [38]

Answer : The value of K_p at this temperature is 66.7

Explanation : Given,

Pressure of PCl_3 at equilibrium = 0.348 atm

Pressure of Cl_2 at equilibrium = 0.441 atm

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The balanced equilibrium reaction is,

PCl_3(g)+Cl_2(g)\rightleftharpoons PCl_5(g)

The expression of equilibrium constant K_p for the reaction will be:

K_p=\frac{(p_{PCl_5})}{(p_{PCl_3})(p_{Cl_2})}

Now put all the values in this expression, we get :

K_p=\frac{(10.24)}{(0.348)(0.441)}

K_p=66.7

Therefore, the value of K_p at this temperature is 66.7

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Ostrovityanka [42]
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7 0
3 years ago
An investor has an account with stock from two different companies. Last year, his stock in Company A was worth $7200 and his st
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Answer:

22.7%

Explanation:

Given that last year stock for company A was $7200

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Stock in company A decreased by 24%

This means the new value of stock for company A became;

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76/100*$7200

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Stock in company B decreased by 20%

This means the new value of stock for company B became;

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80/100*$3510

0.8*$3510

$2808

Original investors stock value was = $7200+$3510 =$10710

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=22.7%

7 0
2 years ago
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