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fiasKO [112]
3 years ago
12

What mass of water will change its temperature by 3.0 0C when 525 J of heat is added to it? The specific heat of water is 4.184

J/g 0C.
Chemistry
1 answer:
pav-90 [236]3 years ago
4 0

Answer:

Mass of water = 41.8 g

Explanation:

Given data:

Mass of water = ?

Change in temperature = 3.0 °C

Specific heat capacity = 4.184 j/g.°C

Heat absorbed = 525 j

Solution:

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

ΔT = 3.0°C

Now we will put the values in formula.

525 J = m × 4.184 j/g.°C  × 3.0°C

525 J = m × 12.552 j/g

m =  525 J/ 12.552 j/g

m = 41.8 g

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The theoretical yield of ammonia in an industrial synthesis was 550 kg, but only 480 kg was obtained. What was the percentage yi
bezimeni [28]

Theoretical yield 550 kg - 100%

Actual yield 480 kg - x%


x= 480*100/550 ≈ 87.3 %


Percentage yield ≈ 87.3 %.



8 0
3 years ago
Calculate the mass of magnesium carbonate ( MgCO3), in grams, required to produce 110.0 g of carbon dioxide using the following
bearhunter [10]

Answer:

210.7~g~MgCO_3

Explanation:

We have to start with the <u>reaction</u>:

MgCO_3~->~MgO~+~CO_2

We have the same amount of atoms on both sides, so, we can continue. The next step is to find the <u>number of moles</u> that we have in the 110.0 g of carbon dioxide, to this, we have to know the <u>atomic mass of each atom</u>:

C: 12 g/mol

O: 16 g/mol

Mg: 23.3 g/mol

If we take into account the number of atoms in the formula, we can calculate the <u>molar mass</u> of carbon dioxide:

(12*1)+(16*2)=44~g/mol

In other words: 1~mol~CO_2=~44~g~CO_2. With this in mind, we can calculate the moles:

110~g~CO_2\frac{1~mol~CO_2}{44~g~CO_2}=25~mol~CO_2

Now, the <u>molar ratio</u> between carbon dioxide and magnesium carbonate is 1:1, so:

2.5~mol~CO_2=2.5~mol~MgCO_3

With the molar mass of MgCO_3 ((23.3*1)+(12*1)+(16*3)=84.3~g/mol. With this in mind, we can calculate the <u>grams of magnesium carbonate</u>:

2.5~mol~MgCO_3\frac{84.3~g~MgCO_3}{1~mol~MgCO_3}=210.7~g~MgCO_3

I hope it helps!

8 0
3 years ago
What kind of chemical reaction occurs in a hand-warming product that is worn inside gloves? Explain your answer.
ch4aika [34]

Answer:

exothermic

Explanation:

Disposable hand warmers turn up the heat in your mittens by means of an exothermic reaction that, in essence, just creates rust.

5 0
3 years ago
Earth’s early atmosphere was very different from our current atmosphere. Explain the presence or absence of gases in our current
Ivanshal [37]

Answer:

heavier gases - sank to the surface

lighter gases - escaped into space

oxygen - produced through photosynthesis

carbon dioxide - released by volcanoes

Explanation:

Since the formation of the atmosphere on Earth, there has been constant changes in it, gradually leading to the atmosphere that we have nowadays. In the distant past, the atmosphere was much different, and it took lot of time for it to become what it is. The volcanoes with their activity contributed to constant release of carbon dioxide, resulting in the greenhouse effect. The organisms that are able to perform photosynthesis started to release lot of oxygen into the atmosphere, thus setting up better living conditions. The gravity of our planet contributed to the vertical distribution of the gasses, with the heavier being lower, and the lighter ones being further up or released into space.

4 0
3 years ago
APPLYING SKILLS #1 &amp; #2: Calculating the percentage yield
Bond [772]

Answer:

69.8 %.

Explanation:

2Na + Cl2 = 2NaCl

Using Relative Atomic Masses:

2*22.99 g sodium should produce  2*(22.99 + 35.45) =   116.88 g of sodium chloride

So 5.75 g Na should give 116.88 * 5.75 / 2*22.99 g = 14.62 g NaCl

% yield = 10.2 / 14.62 = 69.8%.

3 0
3 years ago
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