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fiasKO [112]
3 years ago
12

18. If the pH of a strong acid solution is known to be 3.25, what is the [H+)?

Chemistry
1 answer:
Korolek [52]3 years ago
7 0
[H+] is 5.623*10^-4
2.poH is 10.75
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If a 95.0 gram sample of metal at 100.0 oC is placed in 50.0 g of water with an initial temperature of 22.5oC and the final temp
kaheart [24]

Answer : The specific heat of the metal is, 1.11J/g^oC

Explanation

In this problem we assumed that heat given by the hot body is equal to the heat taken by the cold body.

q_1=-q_2

m_1\times c_1\times (T_f-T_1)=-m_2\times c_2\times (T_f-T_2)

where,

c_1 = specific heat of metal = ?

c_2 = specific heat of water = 4.18J/g^oC

m_1 = mass of metal = 95.0g

m_2 = mass of water  = 50.0 g

T_f = final temperature of mixture = 48.5^oC

T_1 = initial temperature of metal = 100.0.0^oC

T_2 = initial temperature of water = 22.5^oC

Now put all the given values in the above formula, we get

(95.0g)\times c_1\times (48.5-100.0)^oC=-[(50.0g)\times 4.18J/g^oC\times (48.5-22.5)^oC]

c_1=1.11J/g^oC

Therefore, the specific heat of the metal is, 1.11J/g^oC

8 0
4 years ago
Rain freezes as it hits the ground to form solid water is this a physical change or chemical change?
saul85 [17]
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3 0
3 years ago
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Red mercury (II) oxide decomposes to form mercury metal and oxygen gas according to the following equation: 2HgO (s) 2Hg (l) + O
diamong [38]

hey there!:

2HgO (s) =>  2Hg (l) + O2 (g)

2 moles of HgO decompose to form 2 moles of Hg and 1 mole of O2 according to the reaction mentioned in the question.

So 4.00 moles of HgO must give 4 moles of Hg and 2 moles of O2 theoretically.

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= ( 3/4) * 100

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Hope this helps!

7 0
3 years ago
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What is the maximum number of electrons in the following energy level? n = 3
11Alexandr11 [23.1K]
Answer is: 18 electrons.

<span>The principal quantum number (n) is one of four quantum numbers which are assigned to each electron in an atom to describe that electron's state.
The azimuthal quantum number (l) is a quantum number for an atomic orbital that determines its orbital angular momentum and describes the shape of the orbital, l = 0....n-1.</span>

<span>For n = 3, l = 0, 1, 2.</span>

<span>l = 0, s orbital with 2 electron.</span>

<span>l = 1, p orbitals with 6 electrons.</span>

<span>l = 2, d orbitals with 10 electrons.</span>

<span>2 + 6 + 10 = 18 electrons.</span>


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4 years ago
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