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andreev551 [17]
3 years ago
5

2. How many grams of water can be heated from 20.0 oC to 75oC using 12500.0 Joules?

Chemistry
2 answers:
Katyanochek1 [597]3 years ago
8 0
Q=12500.0 J
t₁=20.0°C
t₂=75°C
c=4200 J/(kg·°C)

Q=cm(t₂-t₁)
m=Q/{c(t₂-t₁)}

m=12500.0/{4200(75-20)}=0.0541 kg = 54.1 g
kenny6666 [7]3 years ago
4 0

Answer;

  = 0.054 kg or 54 g

Explanation;

Using the equation; Q = mcΔT where Q is the quantity of heat transferred, m is the mass, c is specific heat of the substance, ΔT is delta T, the change in temperature.  

ΔT = 75 - 20 = 55 C.  

Solve the equation for m  

m = Q/ cΔT

Mass = 12500 / (55 × 4200)

        = 0.054 kg or 54 g


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3 years ago
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A 12.82 g sample of a compound contains 4.09 g potassium (K), 3.71 g chlorine (Cl), and oxygen (O). Calculate the empirical form
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moles of   K  =  4.09g/39 g/mol(molar  mass  of K)  =  0.105  moles
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then  calculate e  mole ratio by  dividing  each  mole  by  the  smallest  number  of  moles  (  0.105 moles)

K=0.105/0.105= 1
Cl=0.105 /0.105=1
O=  0.314/0.105=3

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What is the ph of an aqueous solution with the hydronium ion concentration : [h3o+] = 3 x 10-5 m ?
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The concentration of hydrogen can be shown as:

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Now molecules:
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Answer:

a

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