Identify the item that does not have kinetic energy.

Chemistry

1 answer:

d1i1m1o1n [39]3 years ago

4 0

Answer:

Explanation:

there is no other answer choice that does not move. This is a fool-proof question because all the other answer choices contain movement except the butterfly resting

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If 5.0 moles of C3H8 react, how many molecules of water are formed?

Lady_Fox [76]

Propane is C3H8

The balanced equation is:
C3H8 + 5 O2 --> 3 CO2 + 4 H2O
From the balanced equation you can see that for each mole of C3H8 you obtain 4 moles of H2O.

moles H2O = 5.0 moles C3H8(4 moles H2O/1 mole C3H8) = 20 moles H2O formed

Use Avogadro's number to find the number of molecules.
molecules H2O = 20 moles H2O(6.02 x 10^23 molecules/1 mole) = 1.20 x 10^25 H2O molecules

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3 years ago

Which of the following best defines the term oxidation state?

eimsori [14]

C seems to be the best answer

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3 years ago

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castortr0y [4]

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3 years ago

Find the enthalpy of neutralization of HCl and NaOH. 87 cm3 of 1.6 mol dm-3 hydrochloric acid was neutralized by 87 cm3 of 1.6 m

olga nikolaevna [1]

Explanation:

The reaction equation for the given reaction will be as follows.

$HCl + NaOH \rightarrow NaCl + H_{2}O$

Each mole of both HCl and NaOH gives one mole of water.

Also, it is given that 1 liter of NaOH and HCl solution contains 1.6 mol $dm^{-3}$ of NaOH (HCl).

It is known that 1 $cm^{3}$ = 0.001 liter. So, 87 $cm^{3}$ = 0.087 liter.

Hence, number of moles of water obtained from the given reaction are as follows.

0.087 liter × 1.6 mol = 0.1392 moles

No. of moles = $\frac{mass}{molar mass of water}$

0.1392 moles = $\frac{mass}{18 g/mol}$

mass = 2.5056 g

Now, volume of water present before the reaction is $2 \times 0.087$ liter = 0.174 liter or 0.174 Kg (as density is 1 $Kg/cm^{3}$ ) or 174 g (as 1 kg = 1000 g).