CHEMISTRY HIGH SCHOOL

How many moles are in 987 grams of Ra(OH)2?

Answers

Answer 1

Answer:

The number of moles in 987 grams of Ra(OH)2 = 3.8 moles

Calculating number of moles

Ra = 226g

O= 16g

H = 1

Therefore molar mass of Ra(OH)2= 226+ (16+1)×2

= 260g/mol

The molar mass of Ra(OH)2 = 260g/mol

Thus means that 260g of Ra(OH)2 makes up 1 mole

Therefore, 987 g = X moles

Make X moles the subject of formula,

X mole = 987/260

= 3.8 moles

Therefore, the number of moles in 987 grams of Ra(OH)2 = 3.8 moles

Learn more about molar mass here:

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Answer 2

Answer:

Answer : 3.79 moles are in 987 grams of $Ra(OH)_2$ .

Solution : Given,

Mass of $Ra(OH)_2$ = 987 g

Molar mass of $Ra(OH)_2$ = 260 g/mole

Now we have to calculate the moles of $Ra(OH)_2$ .

Formula used :

$\text{Moles of }Ra(OH)_2=\frac{\text{Mass of }Ra(OH)_2}{\text{Molar mass of }Ra(OH)_2}$

Now put all the given values in this formula, we get the moles.

$\text{Moles of }Ra(OH)_2=(987g)/(260g/mole)=3.79moles$

Therefore, 3.79 moles are in 987 grams of $Ra(OH)_2$ .

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H2(g) + CO2(g) + 10 kcal H2O(g) + CO(g)In another experiment involving the above reaction at 1,000°C, the equilibrium concentrations were found to be:

H2(g) = 2.0 moles per liter
H2O(g) = 4.0 moles per liter
CO2(g) = 5.0 moles per liter
CO(g) = 4.0 moles per liter

What is the equilibrium constant, Keq, for this reaction?

Answers

Answer: The equilibrium constant for the given reaction is 0.8

Explanation:

Equilibrium constant is defined as the ratio of concentration of the products raised to the power its stoichiometric coefficients to the concentration of reactants raised to power its stoichiometric coefficient. It is represented as $K_c$

For the general equation:

$aA+bB\rightleftharpoons cC+dD$

The equilibrium constant is represented as:

$K_c=([C]^c[D]^d)/([A]^a[B]^b)$

For the given chemical equation:

$H_2(g)+CO_2(g)+10 kcal\rightleftharpoons H_2O(g)+CO(g)$

$K_c$ for this equation is given by:

$K_c=([H_2O][CO])/([H_2][CO_2])$

Concentration at equilibrium of

$H_2=2mol/L\nH_2O=4mol/L\nCO_2=5mol/L\nCO=4mol/L$

Putting values in above equation, we get:

$K_c=(4* 4)/(2* 5)\nK_c=0.8$

Hence, the equilibrium constant for the given chemical reaction is 0.8

This might be a little hard for me but I got it. So you have 2.0, 4.0, 5.0 and 4.0. Subtract from 3.0 - 2.0 = 1.0 and 4.5 - 2.0 = 2.5.

So now we have other answers.

H20, H2, CO2 and CO

Keq reaction for each formula is 1.6

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In clinical brachytherapy, the supervision of radio elements and dose interpretation are performed by the therapeutic ____________________ (two words).

Answers

Answer:

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Cancer is one of the most deadly disease and half of the world population died due to cancer every year. Cancer might occur due to the mutation in the genes that control the cell cycle.

The oncologist may be defined as the individual that has specialized in the cancer and its treatment. The different radiation might use to kill the cancerous cell and the radio elements are administered in the drugs used during the chemotherapy.

Thus, the answer is radiation oncologist.

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Answers

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Answers

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The invisible electric force field around charged objects depends on

Answers

The invisible electric force field around charged objects depends on the amount of charge, distance involved, and shape of the objects.

What does the formation of charged object depend on ?

The formation of charged matter is depends on the transfer of electrons, either within a material or between two materials. There are three ways this can occur are known as conduction, polarization, and friction.

Charged objects surround themselves with an imperceptible electric force field. The charge, distance, and shape of the items are only a few of the factors that affect strong field.

The electric charge on the particles and the separation between them determine the strength of the electric force. Greater force is produced by larger charges.

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HELP ME PLEASE 40 POINTS You may select a topic from the list below, or choose your own.black hole
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supernovae
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quasar
Use the library and other resource materials to research and understand your topic. Remember that nasa.gov is a web site that has reliable information as well that you may use for your research. Now write a 300-word report on what you have learned in the essay box below.

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