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dolphi86 [110]
3 years ago
11

A _____ is a place where magma reaches Earth's surface to become lava, which can come out of an opening called a _____. A. crate

r; fissure B. fissure; crater C. volcano; crater D. volcano; fissure
Chemistry
2 answers:
IRINA_888 [86]3 years ago
4 0
The answer is:
D. volcano, fissure :)
Temka [501]3 years ago
4 0
C. Volcano;Crater


This is because magma usually comes out of a volcano and the opening is called crater and not fissure as the other person said.
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<u>Answer:</u> The enthalpy change of the reaction is -27. kJ/mol

<u>Explanation:</u>

To calculate the mass of water, we use the equation:

\text{Density of substance}=\frac{\text{Mass of substance}}{\text{Volume of substance}}

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Volume of water = 25.0 mL

Putting values in above equation, we get:

1g/mL=\frac{\text{Mass of water}}{25.0mL}\\\\\text{Mass of water}=(1g/mL\times 25.0mL)=25g

To calculate the heat released by the reaction, we use the equation:

q=mc\Delta T

where,

q = heat released

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\Delta T = change in temperature = T_2-T_1=(21.9-25.8)^oC=-3.9^oC

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\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}

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\text{Moles of ammonium nitrate}=\frac{1.25g}{80g/mol}=0.0156mol

To calculate the enthalpy change of the reaction, we use the equation:

\Delta H_{rxn}=\frac{q}{n}

where,

q = amount of heat released = -0.428 kJ

n = number of moles = 0.0156 moles

\Delta H_{rxn} = enthalpy change of the reaction

Putting values in above equation, we get:

\Delta H_{rxn}=\frac{-0.428kJ}{0.0156mol}=-27.44kJ/mol

Hence, the enthalpy change of the reaction is -27. kJ/mol

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