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pentagon [3]
3 years ago
9

About half of the electricity in the United States is generated using _____. natural gas biomass coal hydropower

Chemistry
2 answers:
kiruha [24]3 years ago
6 0
Late Reply. Should be Hydropower ,if i'm correct.
galben [10]3 years ago
6 0

Answer: Natural gas.

Explanation: In United states, around 7.5% of electricity is generated using hydro power. 27% of electricity is generated using coal. 35% electricity is generated using natural gas and 1.5% is generated using biomass.

So, comparing the above data, the maximum percentage (35%) of electricity is generated using natural gas.

Hence, About half of the electricity in the United States is generated using natural gas.

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Calculate the standard enthalpy change for the reaction at 25 ∘ C. Standard enthalpy of formation values can be found in this li
meriva

Answer:

The standard enthalpy change for the reaction at 25^{0}\textrm{C} is -2043.999kJ

Explanation:

Standard enthalpy change (\Delta H_{rxn}^{0}) for the given reaction is expressed as:

\Delta H_{rxn}^{0}=[3mol\times \Delta H_{f}^{0}(CO_{2})_{g}]+[4mol\times \Delta H_{f}^{0}(H_{2}O)_{g}]-[1mol\times \Delta H_{f}^{0}(C_{3}H_{8})_{g}]-[5mol\times \Delta H_{f}^{0}(O_{2})_{g}]

Where \Delta H_{f}^{0} refers standard enthalpy of formation

Plug in all the given values from literature in the above equation:

\Delta H_{rxn}^{0}=[3mol\times (-393.509kJ/mol)]+[4mol\times (-241.818kJ/mol)]-[1mol\times (-103.8kJ/mol)]-[5mol\times (0kJ/mol)]=-2043.999kJ

4 0
2 years ago
*
NISA [10]

Answer:

B: +3

Explanation:

If Gallium loses 3 electrons, it will become an ion.

The ion will be positively charged because in this new ion, the number of electrons is lesser than the number of protons. The charge difference will impart a positive net charge on the ion.

  • In a neutral atom, the number of electrons and protons are the same.
  • For positively charged ions, the number of protons is greater than the electrons

If Gallium the loss of 3 electrons offsets the charge balance in the chemical specie. Thus, the ion will have a net +3 charge.

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A polymer is a really long chain of smaller molecules (monomers). It's similar to a chain of paper clips because all of the little monomers will attach to each other, forming a long strain.
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Sublimation is when a solid turns directly into a gas, completely bypassing the liquid phase. Dry ice is a good example.
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