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lesantik [10]
3 years ago
8

a 49.2 g sample of solid iron was heated from 16.2c to 58.9c.what ws the energy change?solve for q(heat energy).iron has a speci

fic heat value of .4494
Chemistry
1 answer:
svet-max [94.6K]3 years ago
5 0

Answer:

944.12 J

Explanation:

To solve for the energy change we use the equation Q=mc(Delta)t

Let's identify the variables we have:

m (mass) = 49.2 g

c (specific heat) = .4494

delta t (change in temp.) = final - initial = 58.9-16.2 = 42.7 degrees Celsius

Q= (49.2)(.4494)(42.7)

  = 944.12 J

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ycow [4]

Answer;

294.13 amu

Solution;

-293nv is 293.10 amu and that of 295nv is 295.45 amu

293.05+295.2=588.25

588.25/2= 294.13 amu

an amu of 294.13 using significant figures

3 0
4 years ago
Strigol is an important plant hormone that is released by crops such as rice and sugarcane. Unfortunately for these plants, stri
Len [333]

The hydrogen deficiency index( HDI) of strigol is = 10

<h3>How to calculate HDI:</h3>

The hydrogen deficiency index is used to measure the number of degree of unsaturation of an organic compound.

Strigol is an example of an organic compound because it contains carbons and hydrogen.

To calculate the HDI using the molecular formula given (C19H20O6) the formula for HDI is used which is:

hdi =  \frac{1}{2} (2c + 2 + n - h - x)

where C = number of carbon atoms = 19

n= number of nitrogen atoms = 0

h= number of hydrogen atoms = 20

X = number of halogen atoms = 0

Note that oxygen was not considered because it forms two bonds and has no impact.

There for HDI =

\frac{1}{2} (2 \times 19 + 2 + 0 - 20 - 0)

HDI=

\frac{1}{2} (40 - 20)

HDI =

\frac{1}{2}  \times 20

HDI = 10

Therefore, the hydrogen deficiency index of strigol is = 10

Learn more about unsaturated compounds here:

brainly.com/question/490531

7 0
3 years ago
In what way may drugs be used to affect neurotransmitters?
Orlov [11]
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3 years ago
What is an example of turning chemical energy into light energy?
levacccp [35]
Chemical energy being changed into light energy would happen during phototsynthesis

5 0
4 years ago
If the mass of a material is 104 grams and the volume of the material is 21 cm3, what would the density of the material be?
WITCHER [35]
Remembering that
d = m ÷ v

d = ?
m = 104 g
v = 21 cm³

Therefore:

d = 104 ÷ 21

<span>d = 4,95 g÷cm³</span>
6 0
3 years ago
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