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raketka [301]
4 years ago
10

Calculate the [OH-] if the pOH = 2.55.

Chemistry
1 answer:
Fynjy0 [20]4 years ago
6 0

Answer: d

Explanation:it’s physics no so hard

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Hard water often contains dissolved Ca2+ and Mg2+ ions. One way to soften water is to add phosphates. The phosphate ion forms in
dalvyx [7]

Answer:

30 g

Explanation:

<em>For CaCl₂</em>

3CaCl₂ + 2Na₃PO₄ ⟶ Ca₃(PO₄)₂ + 6NaCl

Moles of CaCl₂ = <em>c</em>×<em>V</em> = 5.0 × 10⁻² × 2.0 = 0.100 mol

Moles of Na₃PO₄ = 0.100 × 2/3 = 0.0667 mol

Mass of Na₃PO₄ = 0.0667 × 163.94 = 10.9 g

———————————————————

<em>For Mg(NO₃)₂ </em>

3Mg(NO₃)₂  + 2Na₃PO₄ ⟶ Mg₃(PO₄)₂ + 6NaCl

Moles of Mg(NO₃)₃ = <em>c</em>×<em>V</em> = 8.5 × 10⁻² × 2.0 = 0.170 mol

Moles of Na₃PO₄ = 0.170 × 2/3 = 0.113 mol

Mass of Na₃PO₄ = 0.113 × 163.94 = 1 g

—————————————————

Total mass of Na₃PO₄ = 10.9 + 18.6 = 29.5 g

To two significant figures, mass = 30 g

6 0
3 years ago
Why do people have swollen lymph nodes when they are sick?
Ray Of Light [21]
A. Bacteria are stored in the lymph nodes
5 0
3 years ago
Read 2 more answers
How far does light travel in 3.0 days
MArishka [77]

Answer:

d=7.77\times 10^{13}\ m

Explanation:

We know that the speed of light is equal to 3\times 10^8\ m/s

We need to find how far the light travel in 3 days.

Speed of an object is equal to distance covered divided by time taken.

Also, 1 day = 86400 s

3 days = 259200 s

So,

d=vt

d=3\times 10^8\times 259200\\\\d=7.77\times 10^{13}\ m

So, the light will travel 7.77\times 10^{13}\ m in 3 days.

7 0
3 years ago
Three friends were kicking soccer balls at a neighborhood field. Three soccer balls were rolling across the field. The black soc
BARSIC [14]

Answer: d :The blue and orange soccer balls; they have more mass than the black soccer ball, but changed speed by the same amount.

3 0
3 years ago
Read 2 more answers
What is meant by saying that the latent heat of vaporization of water is 22. 5×10^5 j/kg.
andrey2020 [161]

It means that 22.5×10^5 J of heat is required to change 1 kg of water into steam.

Latent heat of vaporization is amount of energy required to change 1 gram (in this example 1 kilogram) of material from the liquid to the gaseous state at its boiling point.

Boiling point of the water is 100°C.

Joule (J) is the standard unit for energy (in this example heat).

Evaporization is phase change process in which the water changes from a liquid to a gas (water vapor). Fore example, solar radiation can be the source of energy for evaporation.

More about heat of vaporization: brainly.com/question/14679329

#SPJ4

5 0
2 years ago
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