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almond37 [142]
3 years ago
10

2. How much heat is released when 432g of water cools down from 710C to 180C?

Chemistry
1 answer:
nadya68 [22]3 years ago
7 0
The heat released by the water when it cools down by a temperature difference AT

is Q = mC,AT

where

m=432 g is the mass of the water

C, = 4.18J/gºC

is the specific heat capacity of water

AT = 71°C -18°C = 530

is the decrease of temperature of the water

Plugging the numbers into the equation, we find

Q = (4329)(4.18J/9°C)(53°C) = 9.57. 104J

and this is the amount of heat released by the water.
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what is the molecular formula of benzoyl peroxide (c7h5o2) of the molecular mass is 0.242 kg/mol?(show work please)
AfilCa [17]

Answer : The molecular formula of benzoyl peroxide is C_{14}H_{10}O_4

Explanation :

Empirical formula : It is the simplest form of the chemical formula which depicts the whole number of atoms of each element present in the compound.  

Molecular formula : it is the chemical formula which depicts the actual number of atoms of each element present in the compound.  

For determining the molecular formula, we need to determine the valency which is multiplied by each element to get the molecular formula.

The equation used to calculate the valency is :

n=\frac{\text{Molecular mass}}{\text{Empirical mass}}

As we are given that the molar mass of compound is, 0.242 kg/mol.

Molecular mass = 0.242 kg/mol = 242 g/mol      (1 kg = 1000 g)

The empirical mass of C_7H_5O_2 = 7(12) + 5(1) + 2(16) = 121 g/eq

n=\frac{\text{Molecular mass}}{\text{Empirical mass}}

n=\frac{242}{121}

n=2

Molecular formula = (C_7H_5O_2)_n = (C_7H_5O_2)_2 = C_{14}H_{10}O_4

Thus, the molecular formula of benzoyl peroxide is C_{14}H_{10}O_4

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HF and NaF - If the right concentrations of aqueous solutions are present, they can produce a buffer solution.

<h3>What are buffer solutions and how do they differ?</h3>
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  • Acidic buffers are solutions that contain a weak acid and one of its salts and have a pH below 7.
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<h3>Describe buffer solution via an example.</h3>
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learn more about buffer solutions here

<u>brainly.com/question/8676275</u>

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What is the name of the compound PbS2 • 4H2O?
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