How many neutrons are in selenium -36?

Chemistry

1 answer:

Soloha48 [4]3 years ago

5 0

Selenium (Se) the most common isotope of this element. The nucleus consists of 34 protons (red) and 46 neutrons (blue).

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students used a balance and a graduated cylinder to collect the data shown in table 7. calculate the density of the sample. if t

Licemer1 [7]

Answer:

Percentage error = 1.88 %

Solution:

Data Given:

Mass of Sample = 20.46 g

Volume of Sample = 43.0 mL - 40.0 mL = 3.0 mL

Formula Used:

Density = Mass / Volume

Putting values,

Density = 20.46 g / 3.0 mL

Density = 6.82 g.mL⁻¹

Percentage Error:

Experimental Value = 6.82 g.mL⁻¹

Accepted Value = 6.95 g.mL⁻¹

= 6.82 g.mL⁻¹ / 6.95 g.mL⁻¹ × 100 = 98.12 %

Percentage Error = 100 % - 98.12 %

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You used a calorimeter in the heat transfer lab. Explain how the calorimeter works, and how to calculate the heat given off or a

Olenka [21]

A calorimeter contains reactants and a substance to absorb the heat absorbed. The initial temperature (before the reaction) of the heat absorbent is measured and then the final temperature (after the reaction) is also measured. The absorbent's specific heat capacity and mass are also known. Given all of this data, the equation:
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To find the heat released.

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3 years ago

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How demanding is lime and cement in our world's economy?

Serggg [28]

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2 years ago

HELP!!! DUE TONIGHT!!

IRINA_888 [86]

Answer:

K I will attempt

Explanation:

$O_2_{(g)}+ 2H_2_{(g)} => 2H_2O_{(l)}\\$

1 : 2 : 2 (I don't know if this is what the question wants but it is what I would answer)

Hydrogen because it requires 2 moles of H2 to react with 1 mole of O2

24 moles of water. Look at stoichiometric coefficient. 2:2 means 24 moles you get 24 moles

Oxygen. 2 < 5/2. Remember, 1 mole of O2 requires 2 moles of H2. But 5/2 is still greater than 2

First, let's find out how many moles of water we can get. Since O2 is the limiting reactant, and O2:H2O ratio is 1:2, we will get 4 moles of H2O. Then, we can multiply 4 by Avogadro's number which is $6.022*10^{23}$ to get the number of molecules. We get: 2.41 * 10^24 molecules of water.