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4 years ago

Which of these is a characteristic of science?

Chemistry

1 answer:

kolezko [41]4 years ago

3 0

Answer:

It follows a clearly laid out method.

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10 points<br><br> How many more oxygen atoms are in 3Mg3(PO4)2 than in 4Al2O3?

Feliz [49]

Answer:

12 more oxygen

Explanation:

An atom is the smallest particles that can take part in a chemical reaction

The given compounds are:

3Mg₃(PO₄)₂

Number of oxygen atoms = 3[2 x 4] = 24 oxygen atoms

For;

4Al₂O₃;

Number of oxygen atoms = 4 x 3 = 12 oxygen atoms

In 3Mg₃(PO₄)₂ , there are 24 - 12 = 12 more oxygen atoms than in 4Al₂O₃;

6 0

3 years ago

Read 2 more answers

Describe nucleus of atom

tresset_1 [31]

Answer:

the nucleus is made up of protons and neutrons

5 0

3 years ago

Read 2 more answers

According to the scheme below, How much energy is required to evaporate 54.06 g water (Molecular weight of water is 18.02 g/mol)

Anna71 [15]

Answer:

what

Explanation:

6 0

3 years ago

Camouflage

Finger [1]

The greatest benefit of species diversity is that

6 0

3 years ago

Find an expression for the change in entropy when two blocks of the same substance of equal mass, one at the temperature Th and

Gre4nikov [31]

Explanation:

Relation between entropy change and specific heat is as follows.

$\Delta S = C_{p} log (\frac{T_{2}}{T_{1}})$

The given data is as follows.

mass = 500 g, $C_{p}$ = 24.4 J/mol K

$T_{h}$ = 500 K, $T_{c}$ = 250 K

Mass number of copper = 63.54 g /mol

Number of moles = $\frac{mass}{/text{\molar mass}}$

= $\frac{500}{63.54}$

= 7.86 moles

Now, equating the entropy change for both the substances as follows.

$7.86 \times 24.4 \times [T_{f} - 250]$ = $7.86 \times 24.4 \times [500 -T_{f}]$

$T_{f} - 250 = 500 - T_{f}$

$2T_{f}$ = 750

So, $T_{f}$ = $375^{o}C$

For the metal block A, change in entropy is as follows.

$\Delta S = C_{p} log (\frac{T_{2}}{T_{1}})$

= $24.4 log [\frac{375}{500}]$

= -3.04 J/ K mol

For the block B, change in entropy is as follows.

$\Delta S = C_{p} log (\frac{T_{2}}{T_{1}})$

= $24.4 log [\frac{375}{250}]$

= 4.296 J/Kmol

And, total entropy change will be as follows.

= 4.296 + (-3.04)

= 1.256 J/Kmol

Thus, we can conclude that change in entropy of block A is -3.04 J/ K mol and change in entropy of block B is 4.296 J/Kmol.

8 0

3 years ago