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2 years ago

HELP 30 Points !

Chemistry

2 answers:

Anestetic [448]2 years ago

8 0

2Na3(PO4)+ 3Cu(SO4) ➡️3Na2(SO4)+Cu3(PO4)2

Katarina [22]2 years ago

4 0

Answer:

The answer to your question is below

Explanation:

In a double displacement reaction, the cations interchange between the two reactants.

Na₃PO₄ + CuSO₄ ⇒ Na₂SO₄ + Cu₃(PO₄)₂

Now, we need to balance the equation

Na₃PO₄ + CuSO₄ ⇒ Na₂SO₄ + Cu₃(PO₄)₂

Reactants Elements Products

3 Na 2

1 P 2

1 Cu 1

1 S 1

8 O 12

This reaction is unbalanced so we need to balance it.

2Na₃PO₄ + 3CuSO₄ ⇒ 3Na₂SO₄ + Cu₃(PO₄)₂

Reactants Elements Products

6 Na 6

2 P 2

3 Cu 3

3 S 3

20 O 20

Now the equation is balanced

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One crystalline form of silica (SiO2) has a cubic unit cell, and from X-ray diffraction data it is known that the cell edge leng

tigry1 [53]

Answer:

There are 8Si atoms and 16 O atoms per unit cell

Explanation:

From the question we are told that:

Edge length $l=0.700nm=>0.7*10^9nm$

Density $\rho=2.32g/cm^3$

Generally the equation for Volume is mathematically given by

$V=l^3$

$V=(0.7*10^9)m^3$

$V=3,43*10^-{22}cm$

Where

Molar mass of (SiO2) for one formula unit

$M=28+32$

$M=60g/mol$

Therefore

Density of Si per unit length is

$\rho_{si}=\frac{9.96*10^{23}}{3.43*10^22}$

$\rho=0.29$

Molar mass of (SiO2) for one formula unit

$M=28+32$

$M=60g/mol$

Therefore

There are 8Si atoms and 16 O atoms per unit cell

6 0

3 years ago

Which expression represents a reaction rate?a. time/massc. energy/timeb. number/timed. time/energy

Kitty [74]

The right answer for the question that is being asked and shown above is that: "b. number/timed." Reaction Rate refers to the speed of reaction for a reactant or product in a particular reaction is intuitively defined as how fast or slow are action takes place.

4 0

2 years ago

Read 2 more answers

Chloroform is an excellent solvent for extracting caffeine from water. The distribution coefficient, KD, (Cchloroform/Cwater) fo

Art [367]

The relative volumes of chloroform and water that should be used is 9:10

Concentration of solution in chloroform = $90$ ( moles of chloroform )

Concentration of solution in water = $10$ ( moles of water )

Dissociation constant at $25^oC$ ; $K_D = 10$

$K_D =$ Concentration of solution in chloroform / Concentration of solution in water

Meaning;

$K_D = \frac{\frac{mole\ of\ chloroform}{volume\ of\ chloroform} }{\frac{mole\ of\ water}{volume\ of\ water} }$

Since $90$ mole is present in chloroform and $10$ mole is present in water, Total mole of Caffeine present is $100$

Now, we substitute our given values into the equation

$10 = \frac{\frac{90}{volume\ of\ chloroform} }{\frac{10}{volume\ of\ water} }\\\\10 *\frac{10}{volume\ of\ water} = \frac{90}{volume\ of\ chloroform} \\\\\frac{100}{volume\ of\ water} = \frac{90}{volume\ of\ chloroform}\\\\\frac{volume\ of\ chloroform}{volume\ of\ water} = \frac{90}{100}\\\\ \frac{volume\ of\ chloroform}{volume\ of\ water} = \frac{9}{10}\\\\ \frac{volume\ of\ chloroform}{volume\ of\ water} = 9:10$