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ki77a [65]
2 years ago
6

Perform the following calculations and express the answer with the proper significant

Chemistry
2 answers:
Romashka [77]2 years ago
8 0

Answer:

The answer is

210.6+14.57=225.17mm.

Anuta_ua [19.1K]2 years ago
8 0

Answer:

Explanation:

0.15 MG +1.15 MG +2.051 MG

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An unknown piece of metal weighing 95.0 g is heated to 98.0°C. It is dropped into 250.0 g of water at 23.0°C. When equilibrium i
lutik1710 [3]

Answer:

C_{metal}=126.6\frac{J}{g\°C}

Explanation:

Hello!

In this case, when two substances at different temperature are put in contact and an equilibrium temperature is attained, we can evidence that the heat lost by the hot substance (metal) is gained by the cold substance (water) and we can write:

Q_{metal}=-Q_{water}

Which can be also written as:

m_{metal}C_{metal}(T_{EQ}-T_{metal})=-m_{water}C_{water}(T_{EQ}-T_{water})

Thus, since we need the specific heat of the metal, we solve for it as shown below:

C_{metal}=\frac{m_{water}C_{water}(T_{EQ}-T_{water})}{-m_{metal}(T_{EQ}-T_{metal})} \\\\C_{metal}=\frac{250.0g*4.184\frac{J}{g\°C}(29.0\°C-98.0\°C)}{95.0g(29.0\°C-23.0\°C)} \\\\C_{metal}=126.6\frac{J}{g\°C}

Best regards.

7 0
2 years ago
When our body temperature starts to increase, the blood flow to the skin increases and we produce large volumes of sweat, which
Troyanec [42]
I took the U.S.A
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5 0
3 years ago
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How many grams of zinc sulfide are used to produce 1.28 grams of zinc oxide?
Lostsunrise [7]

Answer:

0.012288122055459

Explanation:

i might be wrong

6 0
2 years ago
Nitroglycerine decomposes violently according to the chemical equation below. What mass of carbon dioxide gas is produced from t
AveGali [126]

Answer : The mass of CO_2  produced is, 7.74 grams

Solution : Given,

Mass of C_3H_5(NO_3)_3 = 13.3 g

Molar mass of C_3H_5(NO_3)_3 = 227 g/mole

Molar mass of CO_2 = 44 g/mole

First we have to calculate the moles of C_3H_5(NO_3)_3.

\text{ Moles of }C_3H_5(NO_3)_3=\frac{\text{ Mass of }C_3H_5(NO_3)_3}{\text{ Molar mass of }C_3H_5(NO_3)_3}=\frac{13.3g}{227g/mole}=0.0586moles

Now we have to calculate the moles of CO_2

The balanced chemical reaction is,

4C_3H_5(NO_3)_3\rightarrow 12CO_2(g)+6N_2(g)+10H_2O(g)+O_2(g)

From the reaction, we conclude that

As, 4 mole of C_3H_5(NO_3)_3 react to give 12 mole of CO_2

So, 0.0586 moles of C_3H_5(NO_3)_3 react to give 0.0586\times \frac{12}{4}=0.176 moles of CO_2

Now we have to calculate the mass of CO_2

\text{ Mass of }CO_2=\text{ Moles of }CO_2\times \text{ Molar mass of }CO_2

\text{ Mass of }CO_2=(0.176moles)\times (44g/mole)=7.74g

Thus, the mass of CO_2  produced is, 7.74 grams

4 0
3 years ago
Chemistry. Question is on photo. Will mark Brainy for whoever gets this right.
ozzi

Answer:

49.18 eV hope this helps

6 0
2 years ago
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