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3 years ago

How could measuring the melting point of a solid help decide whether it was a mixture or a compound?

Chemistry

1 answer:

mars1129 [50]3 years ago

8 0

Answer: It can't.

Explanation:

In most cases, the melting point alone will not enable you to identify a compound. Millions of solid organic compounds, and their melting points, are known. Perhaps 10,000 of these will have the same melting point as your unknown compound.

Hope this helps!

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At what cold-reservoir temperature (in ∘C) would a Carnot engine with a hot-reservoir temperature of 420 ∘C have an efficiency o

krok68 [10]

Answer:

Tc = 168°C

Explanation:

Carnot engine:

ε = 1 - Tc/Th

∴ ε: efficiency = 60% = 0.60

∴ Th: hot-reservoir temperature = 420°C

∴ Tc: cold-reservoir temperature = ?

⇒ Tc = (1 - ε)×Th

⇒ Tc = ( 1 - 0.60 )×( 420 °C )

⇒ Tc = 168°C

6 0

3 years ago

A chemist reacts 30.0 mL of 5.6 M HCl with an excess of Mg(OH)2 How many grams of magnesium will be produced

Mkey [24]

Answer:

2.042 g

Explanation:

The reaction that takes place is:

2HCl + Mg(OH)₂ → Mg²⁺ + 2Cl⁻ + 2H₂O

First we calculate how many HCl moles were added, using the given volume and concentration:

30 mL ⇒ 30 / 1000 = 0.030 L

5.6 M * 0.030 L = 0.168 mol HCl

Then we convert HCl moles into Mg²⁺ moles, using the stoichiometric coefficients:

0.168 mol HCl * $\frac{1molMg^{+2}}{2molHCl}$ = 0.084 mol Mg⁺²

Finally we convert Mg moles into grams, using its molar mass:

0.084 mol Mg⁺² * 24.305 g/mol = 2.042 g

3 0

3 years ago

Is the ability to be digested a physical or chemical property?

dmitriy555 [2]

I do believe the answer would be physical

4 0

3 years ago

A sample of C3H8 has 3.20 × 1024 H atoms. How many carbon atoms does the sample contain? What is the total mass of the sample in

guajiro [1.7K]

A sample of C3H8 has 3.20 × 10^24 H atoms.

We will use Avogadro's number for this problem. Avogadro's number states that there are 6.022x 10^23 atoms per mole of a substance. We will use dimensional analysis, notice how the units cancel in the computation below:

3.20 × 10^24 atoms H * (1 mole H/6.022x 10^23 atoms H) * (3 moles C/8 moles H) * (6.022x 10^23 atoms C/1 mole C) = 1.2 x 10^24 atoms C

To get the total mass of the sample in grams, let us note that there are 3 moles of carbon and 8 moles of hydrogen per mole of C3H8, and using the molecular weights of C (12 g/mol) and H (1 g/mol), we get (12*3)+(1*8)= 44 g/mol as the molar mass.

3.20 × 10^24 atoms H * (1 mole H/6.022x 10^23 atoms H) * (1 mole C3H8/8 moles H) * (44 g C3H8 / 1 mole C3H8) = 29.23 g C3H8

4 0

3 years ago

A chemist adds 255.0mL of a 1.27M sodium carbonate Na2CO3 solution to a reaction flask. Calculate the mass in grams of sodium ca

photoshop1234 [79]

Answer: The mass in grams of sodium carbonate is 34.3 g

Explanation:

Molarity of a solution is defined as the number of moles of solute dissolved per liter of the solution.

$Molarity=\frac{n\times 1000}{V_s}$