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3 years ago

Two water solutions that have a density of

Chemistry

1 answer:

Colt1911 [192]3 years ago

5 0

<h2>Answer : 627 J</h2><h2>Brainliest</h2>

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How many molecules are in 1.75 moles of Caco3?

saw5 [17]

Answer:

1.054 x 10²⁴ molecules

Explanation:

In order to convert moles of any given substance into a number of molecules, we need to use Avogadro's number, which states the number of molecules -or atoms, in the case of elements- present in one mol:

In one mol there are 6.023x10²³ molecules.

We now convert 1.75 moles into molecules:

1.75 mol * 6.023x10²³ molecules/mol = 1.05x10²⁴ molecules

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3 years ago

The coolant in automobiles is often a 50/50 % by volume mixture of ethylene glycol, C2H6O2, and water. At 20°C, the density of e

Misha Larkins [42]

Explanation:

Let the volume of the solution be 100 ml.

As the volume of glycol = 50 = volume of water

Hence, the number of moles of glycol = $\frac{mass}{molar mass}$

= $\frac{density \times volume}{molar mass}$

= $\frac{1.1088 \times 50}{62 g/mol}$

= 0.894 mol

Hence, number of moles of water = $\frac{50 \times 0.998}{18}$

= 2.77

As glycol is dissolved in water.

So, the molality = $0.894 \times \frac{1000}{49.92}$

= 17.9

Therefore, the expected freezing point = $-1.86 \times 17.9$

= $-33.31^{o}C$

Thus, we can conclude that the expected freezing point is $-33.31^{o}C$ .

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3 years ago

Label the eurkaryotic cell

Scilla [17]

Answer:

Here's your label diagram!

Explanation:

7 0

3 years ago

The type of seismic waves that arrive at the surface first and move by compressing and expanding the ground like an accordion ar

disa [49]

Answer:

p waves

Explanation:

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2 years ago

A compound ‘X’ is used for drinking, has pH =7.Its acidified solution undergoes decomposition in presence of electricity to prod

umka21 [38]

Answer:

X = Water (H2O) ; Y = Hydrogen ; Z = Oxygen

Explanation:

2(H2O) -------> 2H2 + O2

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3 years ago