Describe what an alchemist does

A 100.0-g sample of water at 27.0oC is poured into a 71.0-g sample of water at 89.0oC. What will be the final temperature of the

Sedbober [7]

Answer: The final temperature will be $52.74^oC$

Explanation:

Calculating the heat released or absorbed for the process:

$q=m\times C\times (T_2-T_1)$

In a system, the total amount of heat released is equal to the total amount of heat absorbed.

$q_1=-q_2$

OR

$m_1\times C\times (T_f-T_1)=-m_2\times C\times (T_f-T_2)$ ......(1)

where,

C = heat capacity of water = $4.184J/g^oC$

$m_1$ = mass of water of sample 1 = 100.0 g

$m_2$ = mass of water of sample 2 = 71.0 g

$T_f$ = final temperature of the system = ?

$T_1$ = initial temperature of water of sample 1 = $27^oC$

$T_2$ = initial temperature of the water of sample 2 = $89.0^oC$

Putting values in equation 1, we get:

$100.0\times 4.184\times (T_f-27)=-71.0\times 4.184\times (T_f-89)\\\\171T_f=9019\\\\T_f=\frac{9019}{171}=52.74^oC$

Hence, the final temperature will be $52.74^oC$

6 0

3 years ago

The shoes are green, a size 8, have white laces, made out of cotton, and have a rubber sole. The description given is a list of

Alexxx [7]

Answer:

Physical i think, because it says, "The shoes are green, made of cotton, and rubber sole" everything in the passage described a physical property

Explanation:

tell me if im wrong, good luck

6 0

3 years ago

Read 2 more answers

3 Mg + 1 Fe2O3 --> 2 Fe + 3 MgO

Gala2k [10]

Answer:

Fe₂O₃ is the limiting reactant.

7.57 g of MgO are formed.

Explanation:

3 Mg + 1 Fe₂O₃ → 2 Fe + 3 MgO

First we convert the given masses of both reactants into moles, using their respective molar masses:

15.6 g Mg ÷ 24.305 g/mol = 0.642 mol Mg

10.0 g Fe₂O₃ ÷ 159.69 g/mol = 0.0626 mol Fe₂O₃

0.0626 moles of Fe₂O₃ would react completely with (3 * 0.0626 ) 0.188 moles of Mg. As there are more Mg moles than required, Mg is the reactant in excess; thus, Fe₂O₃ is the limiting reactant.

We now calculate how many MgO moles are produced, using the number of moles of the limiting reactant:

0.0626 mol Fe₂O₃ * $\frac{3molMgO}{1molFe_2O_3}$ = 0.188 mol MgO

Finally we convert moles of MgO into grams:

0.188 mol MgO * 40.3 g/mol = 7.57 g

8 0

3 years ago

Mechanical Energy

andreev551 [17]

Answer:

A

Explanation:

A ball buried under the ground is the answer because it has no kinetic energy because of it's inability to move

8 0

3 years ago

There are 20 mice in a 5 m2 field ecosystem. The population density of mice is _____.

Anna11 [10]

Answer:

4per m 2

20 mice divided by 5 so it will be 4 per m 2

3 0

3 years ago