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Lady_Fox [76]
3 years ago
9

If an engineer's greatest concern is specific impulse, which type of fuel should she use?

Chemistry
1 answer:
alexandr402 [8]3 years ago
8 0

Answer: D. (Liquid fuel)

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Explanation:

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A brick has dimensions of 15 cm x 6.0 cm x 12 cm. What is the volume of the brick in cubi meters?
Likurg_2 [28]
Convert all of the units from centimeters to meters by moving the decimal point over to the left two digits.

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Volume = length x width x height
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3 years ago
Estimate ΔH for the reaction: C2H6(g) + Cl2(g)--&gt; C2H5Cl(g) + HCl(g) given the following average bond energies (in kJ/mol): C
Leno4ka [110]

Explanation:

The reaction equation will be as follows.

    C_{2}H_{6}(g) + Cl_{2}(g) \rightarrow C_{2}H_{5}Cl(g) + HCl(g)

Using bond energies, expression for calculating the value of \Delta H is as follows.

    \Delta H = \sum B.E_{reactants} - \sum B.E_{products}

On reactant side, from C_{2}H_{6} number of bonds are as follows.

C-C bonds = 1

C-H bonds = 6

From Cl_{2}; Cl-Cl bonds = 1

On product side, from C_{2}H_{5}Cl number of bonds are as follows.

C-C bonds = 1

C-H bonds = 5

C-Cl bonds = 1

From HCl; H-Cl bonds = 1

Hence, using the bond energies we will calculate the enthalpy of reaction as follows.

  \Delta H = \sum B.E_{reactants} - \sum B.E_{products}

  =[(1 \times 348 kJ/mol) + (6 \times 414 kJ/mol) + (1 \times 242 kJ/mol)] - [(1 \times 348 kJ/mol) + (5 \times 414 kJ/mol) + (1 \times 327 kJ/mol) + (1 \times 431 kJ/mol)]            = -102 kJ/mol

Thus, we can conclude that change in enthalpy for the given reaction is -102 kJ/mol.

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3 years ago
Ammonia (NH3 (g), Delta.Hf = –45.9 kJ/mol ) reacts with oxygen to produce nitrogen and water (H2 O(g), Delta.Hf = –241.8 kJ/mol)
Bogdan [553]

The enthalpy of the reaction according to given information is –1,267.2 kJ

<h3>What is Enthalpy of the reaction ?</h3>

The Heat of Reaction (also known and Enthalpy of Reaction) is the change in the enthalpy of a chemical reaction that occurs at a constant pressure.

It is a thermodynamic unit of measurement useful for calculating the amount of energy per mole either released or produced in a reaction.

Therefore, The enthalpy of the reaction according to given information is –1,267.2 kJ

Learn more about Enthalpy here ;

brainly.com/question/16720480

#SPJ1

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