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lana [24]
2 years ago
6

500 gram sample of an unknown metal releases 640 Joules as it cools from 55.0 oC to 250 oC. What is the specific heat of the sam

ple?
Chemistry
1 answer:
marshall27 [118]2 years ago
4 0

Answer:

c = 0.043 j/ g. °C

Explanation:

Given data:

Amount of sample = 500 g

Initial temperature = 55.0°C

Final temperature = 25.0°C

Heat required released = 640 J

Specific heat capacity of sample = ?

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 = 25°C - 55°C

ΔT = -30°C

by putting values,

-640 J = 500 g × c × -30 °C

c  = 640 J / 500 g× 30 °C

c = 640 J /15000 g. °C

c = 0.043 j/ g. °C

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3 0
2 years ago
Find the pH and the pOH of the solution
MissTica
Ok so the PH for each solution will be
<span>1.) 1.638 2.) 5.2 3.) 12.524
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5 0
3 years ago
Oxidation unit test
3241004551 [841]

In this case, according to the given information about the oxidation numbers anf the compounds given, it turns out possible to figure out the oxidation number of manganese in both MnI2, manganese (II) iodide and MnO2, manganese (IV) oxide, by using the concept of charge balance.

Thus, we can define the oxidation state of iodine and oxygen as -1 and -2, respectively, since the former needs one electron to complete the octet and the latter, two of them.

Next, we can write the following x, since manganese has five oxidation states, and it is necessary to calculate the appropriate ones:

Mn^xI_2^-\\\\Mn ^xO_2^{-2}

Next, we multiply each anion's oxidation number by the subscript, to obtain the following:

Mn^xI_2^-\rightarrow x-2=0;x=+2\\\\Mn ^xO_2^{-2}\rightarrow x-4=0;x=+4

Thus, the correct choice is Manganese has an oxidation number of +2 in Mnl2 and +4 in MnO2.

Learn more:

  • brainly.com/question/15167411
  • brainly.com/question/6710925
8 0
3 years ago
8 bananas weigh 1pound and sale price is 4 pounds for $5. How much it cost me to buy 25 bananas?
asambeis [7]
It should be 3-4 dallors because 8x3 is 24 and that is 3 pounds and you only have one banana left so is supposed to be 3 dallors and change.
8 0
3 years ago
8. What is the mass of 4.50 x 1022 Cu atoms?​
vladimir2022 [97]

Answer:

4.7485 g

Explanation:

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In every mole of Cu, there are 6.022 x 10^23 atoms (Avogadro's number). The molecular weight of copper is 63.546 g/mol.

5 0
3 years ago
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