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ella [17]
2 years ago
8

How much energy is required to convert 400 g of ice at 0 °C to liquid water at 0 °C?

Chemistry
1 answer:
Tatiana [17]2 years ago
6 0

Answer:

133.20 kJ

Explanation:

The heat of fusion for water is  3.33 x 10^5 J/kg.

(400g)*(1 kg/1000g)*(3.33 x 10^5 J/kg) = 133200 J, or 133.20 kJ for 400g

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1. Magnesium chloride solution reacts with silver nitrate solution to form magnesium nitrate
Whitepunk [10]

a. 1,4332 g

b. 7.54~g

<h3>Further explanation</h3>

Given

Reaction

MgCl2 (s) + 2 AgNO3 (aq) → Mg(NO3)2 (aq) + 2 AgCl (s)

20 cm of 2.5 mol/dm^3 of MgCl2

20 cm of 2.5 g/dm^3 of MgCl2

Required

the mass of silver chloride - AgCl

Solution

a. mol MgCl2 :

\tt 20~cm^3=20\times 10^{-3}~dm^3\\\\mol=M\times V\\\\mol=2.5~mol/dm^3\times 20\times 10^{-3}DM^3=0.05

From equation, mol AgCl = 2 x mol MgCl2=2 x 0.05=0.1

mass AgCl(MW=143,32 g/mol)= 0.1 x 143,32=1,4332 g

b. mol MgCl2 (MW=95.211 /mol):

\tt mol=M\times V\\\\mol=\dfrac{2.5~g/dm^3}{95,211 g/mol}=0.0263~mol/dm^3

From equation, mol AgCl = 2 x mol MgCl2=2 x 0.0263=0.0526

mass AgCl(MW=143,32 g/mol)= 0.0526 x 143,32=7.54~g

6 0
3 years ago
A nitrogen atom in N2 should have a
SIZIF [17.4K]

Answer:

The answer is partial charge 8+.

7 0
2 years ago
A percent composition analysis yields
siniylev [52]

Answer:

PCl₃

Explanation:

To determine the empirical formula of a compound, we need to follow a series of steps.

Step 1: Divide each percent composition by the atomic mass of the element

P: 22.6/30.97 = 0.729

Cl: 77.4/35.45 = 2.18

Step 2: Divide all the numbers by the smallest one, i.e. 0.729

P: 0.729/0.729 = 1

Cl: 2.18/0.729 ≈ 3

The empirical formula of the compound is PCl₃.

3 0
3 years ago
2. Which of the following hydrocarbons would you expect to have the
raketka [301]

Answer:

C  

6

​  

H  

14

​  

 

Explanation:

5 0
2 years ago
What does HNO3 produce when it is placed in a water solution ​
jeka57 [31]

Nitric acid does NOT react with water, water disassociates the molecules into those ions (above). ... Water,Being a polar solvent,…makes HNO3 ionise or dissociate or simply break down into Hydronium ions, i.e,H+ or H3O+ ions and nitrate NO3- ions..that's all.

-Google

4 0
3 years ago
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