**Answer:**

I think that the first one is right(A)

<span>0.0165 m
The balanced equation for the reaction is
AgNO3 + MgCl2 ==> AgCl + Mg(NO3)2
So it's obvious that for each Mg ion, you'll get 1 AgCl molecule as a product. Now calculate the molar mass of AgCl, starting with looking up the atomic weights.
Atomic weight silver = 107.8682
Atomic weight chlorine = 35.453
Molar mass AgCl = 107.8682 + 35.453 = 143.3212 g/mol
Now how many moles were produced?
0.1183 g / 143.3212 g/mol = 0.000825419 mol
So we had 0.000825419 moles of MgCl2 in the sample of 50.0 ml. Since concentration is defined as moles per liter, do the division.
0.000825419 / 0.0500 = 0.016508374 mol/L = 0.016508374 m
Rounding to 3 significant figures gives 0.0165 m</span>

A double replacement is when the reactants switch with their opposite charge. For example, AB + CD = AD + BC.

In this case the given is K2SO4 + Pb(NO3)2 = ____ + ____

**The answers is PbSO4 and KNO3 would expect the products of this reaction.**

**Answer:**

**- **the specific gravity of the block is **0.75**

**- **the specific gravity of the solution is **1.5**

**Explanation:**

Given the data in the question;

first we find the specific gravity of a block SGB

SGB = ( block vol below / total block vol ) × the specific gravity of water

we substitute

SG = ( 1.5 / (1.5 + 0.5 ) ) × 1

SG = ( 1.5 / (1.5 + 0.5 ) ) × 1

SG = (1.5 / 2) × 1

SG = **0.75**

Therefore, the specific gravity of the block is **0.75**

specific gravity of solution SG

SG = (total block vol / block below ) × SG

we substitute

SG = ( 2 / 1 ) × 0.75

SG = 2 × 0.75

SG = **1.5**

Therefore, the specific gravity of the solution is **1.5**

The correct answer is Meters/second