**Answer:**

copper sulphate reacts with sodium hrydroxide to form a blue preipitate of copper hrydroxide and soduim hrydroxide.

Answer: D

Explanation: both experimentation and observation

The yield of lithium chloride is **1.92 grams. **

**Option D. **

<h3><u>Explanation:</u></h3>

In this reaction, we can see that 1 mole of **lithium hydroxide **reacts with 1 mole of **potassium chloride** to produce 1 mole of **lithium chloride** and 1 mole of **potassium hydroxide**.

Molecular weight of lithium hydroxide is **24**.

Molecular weight of lithium chloride is **42.5**.

So 24 grams of lithium hydroxide produces 42.5 grams of lithium chloride.

So, 20 grams of lithium hydroxide produces grams =11. 29 grams of lithium chloride.

But this is when the yield is 100%.

But yield is 17%.

So the yield is 1.92 grams of lithium chloride.

**Answer: 0.217 mol**

**Explanation:**

To find the amount of moles in a 10 g sample, we need the molar mass of ethanol.

**Molar Mass: 46.07 g/mol**

Now that we have the molar mass, we can find moles.

We know that there are **0.217 mol** in a 10.0 gram sample.

**Answer:**

F centripetal force (tension) = 275.9 N

**Explanation:**

**Given data:**

Mass = 1.50 kg

Radius = 0.520 m

Velocity of ball = 9.78 m/s

Tension = ?

**Solution:**

F centripetal force (tension) = m.v² / R

F centripetal force (tension) = 1.50 kg . (9.78 m/s)² / 0.520 m

F centripetal force (tension) = 1.50 kg . 95.65 m²/s² / 0.520 m

F centripetal force (tension) = 143.5 kg. m²/s² / 0.520 m

F centripetal force (tension) = 275.9 N