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lesya [120]
3 years ago
7

Question 8 (2 points)

Chemistry
1 answer:
ladessa [460]3 years ago
8 0
The right amount of h2o would be 3.5 grams but the chemical term is 3.546 gallons. I took the test this is right
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A 30.5-g sample of water at 300. K is mixed with 48.5 g water at 350. K. Calculate the final temperature of the mixture assuming
ahrayia [7]

Answer:

sorry but i cant

Explanation:

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In a combustion experiment, it was found that 12.096 g of hydrogen molecules combined with 96.000 g of oxygen molecules to form
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The mass change, or the mass defect, can be calculated by the formula that is very known to be associated with Albert Einstein. 

E = Δmc²
where
E is the energy gained or released during the reaction
c is the speed of light equal to 3×10⁸ m/s
Δm is the mass change

(1.715×10³ kJ)(1,000 J/1 kJ) = Δm(3×10⁸ m/s)²
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5 0
3 years ago
Balloon A started with a volume of 1.76 L. The temperature of the room the balloon was in was 295 K. The balloon was heated to a
valentina_108 [34]

Answer:

V₂ = 1.5 L

Explanation:

Given data:

Initial volume of balloon = 1.76 L

Initial temperature = 295 K

Final temperature = 253.15 K

Final volume = ?

Solution:

According to this law, The volume of given amount of a gas is directly proportional to its temperature at constant number of moles and pressure.

Mathematical expression:

V₁/T₁ = V₂/T₂

V₁ = Initial volume

T₁ = Initial temperature

V₂ = Final volume  

T₂ = Final temperature

Now we will put the values in formula.

V₁/T₁ = V₂/T₂

V₂ = V₁T₂/T₁  

V₂ = 1.76 L ×253.15 K / 295 K

V₂ = 445.54 L.K /295 K

V₂ = 1.5 L

4 0
3 years ago
Why is scientific notation important in chemistry?
Varvara68 [4.7K]
Calculations in chemistry can range from large numbers to the smallest number in decimals to be more accurate in data results. When this occurs using scientific notations allows you to note down results regardless of size as accurate as possible without writing a lot of numbers.
3 0
3 years ago
How many grams of O2 are formed from 13.34 moles of KClO3? Provide your final answer rounded to two decimal places.
trasher [3.6K]

Answer:

640.32 g

Explanation:

2KClO₃ → 2KCl + 3O₂

First we <u>convert KClO₃ moles to O₂ moles,</u> using the <em>stoichiometric coefficients</em>:

  • 13.34 mol KClO₃ * \frac{3molO_{2}}{2molKClO_{3}} = 20.01 mol O₂

Then we <u>convert O₂ moles to grams</u>, using its <em>molar mass</em>:

  • 20.01 mol O₂ * 32 g/mol = 640.32 g

So 640.32 g of O₂ are formed from 13.34 moles of KClO₃.

5 0
2 years ago
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