Consider this reaction, which occurs in the atmosphere and contributes to photochemical smog: SO2(g) + H2O(l) →H2SO3(g) If there is 18.72 g SO2 and excess H2O present, the reaction yields 17.3 g H2SO3. Calculate the percent yield for the reaction.

72.2 % is the percent yield

Explanation:

Percent yield of a reaction is:

(Produced yield / Theoretical yield) . 100

The produced yield is 17.3 g of sulfurous acid.

Let's determine the theoretical yield. The reaction is:

SO₂(g) + H₂O(l) → H₂SO₃(g)

We convert the mass of sulfur dioxide to moles:

18.72 g / 64.06 g/mol = 0.292 moles.

As ratio is 1:1, for 0.292 moles of dioxide we can produce 0.292 moles of acid. Let's convert the moles to mass in order to determine the 100 % yield reaction. (Theoretical yield). 0.292 mol . 82.06 g/ 1 mol = 23.9 g

We replace data  → (17.3 g / 23.9 g) . 100 = 72.2%

The percent yield of the reactions is 72.1 %

Explanation:

Step 1: Data given

Mass of SO2 = 18.72 grams

Mass of H2SO3 produced = 17.3 grams

Molar mass of SO2 = 64.07 g/mol

Step 2: The balanced equation

SO2(g) + H2O(l) →H2SO3(g)

Step 3: Calculate moles SO2

Moles SO2 = mass SO2 / molar mass SO2

Moles SO2 = 18.72 grams / 64.07 g/mol

Moles SO2 = 0.2922 moles

Step 4: Calculate moles H2SO3

For 1 mol SO2 we need 1 mol H2O to produce 1 mol H2SO3

For 0.2922 moles SO2 we'll have 0.2922 moles H2SO3

Step 5: Calculate mass H2SO3

Mass H2SO3 = 0.2922 moles * 82.07 g/mol

Mass H2SO3 = 23.98 grams

Step 6: Calculate the percent yield

Percent yield = (actual mass/  theoretical mass) * 100%

Percent yield = ( 17.3 grams / 23.98 grams) * 100%

Percent yield = 72.1 %

The percent yield of the reactions is 72.1 %

what is the question here. i think you messed up.

answer is: nuclear fusion produces elements that are heavier than helium.

nuclei combine to form a heavier nucleus, releasing energy.  

for example, fusion of hydrogen atoms at the sun.  

this fusion nuclear reaction is in the inner core of the sun and hydrogen (atomic number 1) is conveted into helium (atomic number 2).  

the inner core is the central region of the sun and all solar energy is produced in the core by nuclear fusion.