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Lunna [17]
3 years ago
12

Plz someone help me with this!

Chemistry
1 answer:
Genrish500 [490]3 years ago
4 0
4 is sound energy and electrical 5 is nuclear energy 5 is mechanical
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Which element, if combined with chlorine, will have the greatest attraction for the chlorine electrons?
tatiyna
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3 years ago
PLSSSSS HELP I DONT GET THIS PROBLEMMMM
Aleks [24]

Answer:

C. 7370 joules.

Explanation:

There is a mistake in the statement. Correct form is described below:

<em>Using the above data table and graph, calculate the total energy in Joules required to raise the temperature of 15 grams of ice at -5.00 °C to water at 35 °C. </em>

The total energy needed to raise the temperature is the combination of latent and sensible heats, all measured in joules, and represented by the following model:

Q = m\cdot [c_{i} \cdot (T_{2}-T_{1})+L_{f} + c_{w}\cdot (T_{3}-T_{2})] (1)

Where:

m - Mass of the sample, in grams.

c_{i} - Specific heat of ice, in joules per gram-degree Celsius.

c_{w} - Specific heat of water, in joules per gram-degree Celsius.

L_{f} - Latent heat of fusion, in joules per gram.

T_{1} - Initial temperature of the sample, in degrees Celsius.

T_{2} - Melting point of water, in degrees Celsius.

T_{3} - Final temperature of water, in degrees Celsius.

Q - Total energy, in joules.

If we know that m = 15\,g, c_{i} = 2.06\,\frac{J}{g\cdot ^{\circ}C}, c_{w} = 4.184\,\frac{J}{g\cdot ^{\circ}C}, L_{f} = 334.72\,\frac{J}{g}, T_{1} = -5\,^{\circ}C, T_{2} = 0\,^{\circ}C and T_{3} = 35\,^{\circ}C, then the final energy to raise the temperature of the sample is:

Q = (15\,g)\cdot \left[\left(2.06\,\frac{J}{g\cdot ^{\circ}C} \right)\cdot (5\,^{\circ}C)+ 334.72\,\frac{J}{g} + \left(4.184\,\frac{J}{g\cdot ^{\circ}C}\right)\cdot (35\,^{\circ}C) \right]

Q = 7371.9\,J

Hence, the correct answer is C.

8 0
3 years ago
Calculate the mass percent composition of nitrogen in co(nh2)2.
Mashcka [7]
The  mass  percentage  composition  of  nitrogen  in  CO(NH2)2  is 46 .7%

    calculation

%  mass  =   molar  mass  of nitrogen/ molar mass  of  Co(NH2)2 

molar mass  of nitrogen =  14 x2 = 28g/mol  since there is  two  nitrogen atom  in  Co(NH2)2\

molar mass  of CO(NH2)2  = 12 + 16 + (14 x2) +( 2 x2)=  60 g/mol

the %  mass  is therefore =28 /  60  x100   =46.7%
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