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omeli [17]
3 years ago
14

How many neutrons would be in an atom of Selenium if the mass number for this particular isotope is Se-80?

Chemistry
1 answer:
EleoNora [17]3 years ago
6 0

Answer:2

Explanation:

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At what temperature will 41.6 grams N, exert a pressure of 815 mmHg in a
ratelena [41]

None of the given options are correct, and the correct answer is 174 K.

<u>Explanation:</u>

Mass of N = 41.6 g

Moles = $\frac{given mass}{molar mass}

      = $\frac{41.6 g}{28 g/ mol} = 1.5 moles

Pressure, P = 815 mm Hg = 1.07 atm

Volume, V = 20 L

R = gas constant = 0.08205 L atm mol⁻¹ K⁻¹

Temperature, T = ? K

We have to use the ideal gas equation,  

PV = nRT  

by rearranging the equation, so that the equation becomes,  

T = $\frac{PV}{nR}

 Plugin the above values, we will get,  

T = $\frac{1.07 \times 20}{1.5 \times 0.08205}

  = 174 K

So the temperature of the nitrogen gas is 174 K.

8 0
3 years ago
Write a hypothesis about the effect of the red light on the population. Use the "if . . . then . . . because . . ." format, and
777dan777 [17]

Answer:

If the color of the light in the environment changes, then the number of light red kidney beans increases because the red light makes the light red kidney beans more difficult to see.

Explanation:

Just did it this is the sample answer

4 0
3 years ago
The decomposition of N_2O_5(g) following 1st order kinetics. N_2O_5(g) to N_2O_4(g) + ½ O_2(g) If 2.56 mg of N_2O_5 is initially
Crank

Answer: The rate constant is 0.334s^{-1}

Explanation ;

Expression for rate law for first order kinetics is given by:

t=\frac{2.303}{k}\log\frac{a}{a-x}

where,

k = rate constant  = ?

t = age of sample  = 4.26 min

a =  initial amount of the reactant  = 2.56 mg

a - x = amount left after decay process  = 2.50 mg

Now put all the given values in above equation to calculate the rate constant ,we get

4.26=\frac{2.303}{k}\log\frac{2.56}{2.50}

k=\frac{2.303}{4.26}\log\frac{2.56}{2.50}

k=5.57\times 10^{-3}min^{-1}=5.57\times 10^{-3}\times 60s^{-1}=0.334s^{-1}

Thus rate constant is [tex]0.334s^{-1}

4 0
3 years ago
9.56 x 105 cg is how many grams? <br><br> 100 centigrams = 1 gram
galben [10]
The answer to this question is 10.038
7 0
3 years ago
PLEASE HELP ME!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
serg [7]

Answer:

ITS B

Explanation:

MY CONSCIOUS MIND IS TELLING ME

6 0
2 years ago
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