Scoring Scheme: 3-3-2-1 Part III. For each trial, enter the amount of heat gained by the chemical system of ammonium nitrate, qrxn. The specific heat of water is 4.184 J/goC. Report your answer using 4 digits. Trial

Question:

The information given is:

Trial #      Tiwater     T f           ΔT        Masswater  (m)

       #1:     21.2         10.8        10.8       24.990

       #2:    20.8        9.50       9.5         25.000

       #3:    20.9        9.20       9.2         25.010

The heat of the reaction is -5985 J

Explanation:

The heat absorbed by the water is given by

ΔQ = m·c·ΔT  

From which

∑ (ΔT·m)/3 = 278.34 kg·°C

ΔQ = c×∑ (ΔT·m)/3 = 4.184 J/g·°C×278.34 kg·°C = 1164.565 J

ΔQ Calorimter = Specific heat capacity of calorimeter, × ΔT

Where the = 443 J/°C for example, we have

ΔQ Calorimter = 443×11.133 = 4820.733 J

From which the heat of reaction is then

Using 4 digits, we get

.

n+h→nh3

we must remember that nitrogen and hydrogen are both diatomic molecules in their standard gas form. this adjusts the equation to

n2+h2→nh3

now we need to adjust coefficients in order to balance the atoms on each side of the equation. currently we have 2 atoms of nitrogen and 2 atoms of hydrogen on the reactant side and 1 atom of nitrogen and 3 atoms of hydrogen on the product side.

we can balance the hydrogens by placing a coefficient of 2 in front of ammonia and a coefficient of 3 in front of the hydrogen.

n2+3h2→2nh3

this gives us 6 hydrogen on each side and coincidentally the nitrogens now equal 2 on each side.

in cartography, a contour line (often just called a "contour") joins points of equal elevation (height) above a given level, such as mean sea level. a contour map is a map illustrated with contour lines, for example a topographic map, which thus shows valleys and hills, and the steepness or gentleness of slopes.

explanation: