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2 years ago

Which of the following statements is true?

Chemistry

2 answers:

zalisa [80]2 years ago

6 0

It's A, t<span>The figure is a molecule and an element.</span>

zhuklara [117]2 years ago

4 0

The answer is A. The figure is a molecule and an element. You're welcome

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How many molecules are in a mole of H2O

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1023 molecules or atoms depending on substance

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2 years ago

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What is 30% NaOH test

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Sodium hydroxide solution 30% CAS 1310-73- 2 Suprapur® - Find MSDS or SDS, a COA, data sheets and more information.

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3 years ago

At what temperature do KCl and NaCl have the same solubility?

Serhud [2]

Answer:

they have the same molar solubility at 44.5 degrees celsius

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2 years ago

A 1.450 g sample of an unknown organic compound , X, is dissolved in 15.0 g of toluene

muminat

Answer:

Molecular weight of the compound = 372.13 g/mol

Explanation:

Depression in freezing point is related with molality of the solution as:

$\Delta T_f = K_f \times m$

Where,

$\Delta T_f$ = Depression in freezing point

$K_f$ = Molal depression constant

m = Molality

$\Delta T_f = K_f \times m$

$1.33 = 5.12 \times m$

m = 0.26

Molality = $\frac{Moles\ of\ solute}{Mass\ of\ solvent\ in\ kg}$

Mass of solvent (toluene) = 15.0 g = 0.015 kg

$0.26 = \frac{Mole\ of\ compound}{0.015}$

Moles of compound = 0.015 × 0.26 = 0.00389 mol

$Mol = \frac{Mass\ in\ g}{Molecular\ weight}$

Mass of the compound = 1.450 g

$Molecular\ weight = \frac{Mass\ in\ g}{Moles}$

Molecular weight = $\frac{1.450}{0.00389} = 372.13\ g/mol$

4 0

2 years ago

60 POINTS! PLEASE ANSWER!

Mumz [18]

I would have helped but I didn’t understand it sorry that I didn’t answer :(

6 0

2 years ago