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3 years ago

will mark you brainliest if answered correctly

Chemistry

1 answer:

lord [1]3 years ago

7 0

Answer:

D. 23.9 liters

Explanation:

Molarity is defined as the no. of moles of solute dissolved in 1.0 L of the solution.

M = (no. of moles)solute / (V of the solution (L))

M = (mass/molar mass)NaCl / (V of the solution (L))

M = 0.03 M, mass of NaCl = 42.0 g, molar mass = 58.44 g/mol.

∴ V of the solution = (mass/molar mass)NaCl / M = [(42.0 g/58.44 g/mol)] / (0.03 M) = 23.96 L.

<em>So, the right choice is: D. 23.9 liters</em>

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3 years ago

1. An electric power plant uses energy from burning coal to generate steam at 450 °C. The plant is cooled by 20 °C water

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Explanation:

Efficiency of the electric power plant is $e=1-\frac{T_{2}}{T_{1}}$

Here Temperature of hot source $T_{1} = 450^{o}C=450+273=723 K$

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Hence the efficiency is $e=1-\frac{293}{723}=0.5947=59.47%$

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3 years ago

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77julia77 [94]

Answer:

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For the acid HNO3, its conjugate base is NO3^- while for the acid H3O^+, its conjugate base is H2O.

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2 years ago

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Answer:

4) Van der waals forces

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3 years ago

** will mark you brainliest if answered correctly **

will mark you brainliest if answered correctly