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True [87]
3 years ago
5

A beaker of 450g of water is heated from 4.0°C to 25.0°C on a hot plate. If the

Chemistry
1 answer:
motikmotik3 years ago
5 0

Answer: 5.13

Explanation: juss do it

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The picture on the left represents the reactants in the equation and the picture on the right represents the products. Does this
JulijaS [17]
According to Law of conservation of matter," matter can neither be created nor destroyed but is conserved and remains constant over time'.

In above picture let suppose the Blue balls represent N₂ molecule and White balls represent H₂ molecules.

So, left picture represent reactants,

                                    2 N₂  +  6 H₂

And , right picture represent products,

                                     4 NH₃

So, there are 4 N atoms and 12 Hydrogen atoms in reactants and 4 N atom and 12 Hydrogen atoms in products. Means the mass of elements is conserved. The overall reactions is as follow,


                                    2 N₂  +  6 H₂   →   4 NH₃

Result:
          Yes! This reaction follow Law of conservation of Matter.
6 0
3 years ago
when 42.66 grams of PCl5 react with excess P4O10 the amount of product formed is 47.22 grams of POCl3. What is the percent yield
icang [17]

Percent yield or yield is mathematically defined as:

Yield = Actual amount / Theoretical amount

So to solve the yield, let us first calculate the theoretical amount of POCl3 produced. The balanced chemical reaction for this is:

6 PCl5 + P4O10  --->  10 POCl3

Since P4O10 is stated to be supplied in large amount, then PCl5 becomes the limiting reactant.

So we calculate for POCl3 based on PCl5. To do this let us convert the amount into moles: (molar mass PCl5 = 208.24 g/mol)

n PCl5 = 42.66 grams / (208.24 g/mol)

n PCl5 = 0.205 mol

 

Now based on the stoichiometric ratio of the reaction:

<span>n POCl3 = 0.205 mol (10 POCl3 / 6 PCl5)
n POCl3 = 0.3414 mol POCl3</span>

Converting to mass (molar mass POCl3 = 153.33 g/mol)

m POCl3 = 0.3414 mol (153.33 g/mol)

m POCl3 = 52.35 g

 

Calculating for yield:

Yield = 47.22 g/ 52.35 g

Yield = 0.902

<span>%Yield = 90.2 %                      (ANSWER)</span>

6 0
3 years ago
In a coffee-cup calorimeter, 1.60 g of NH4NO3 was mixed with 75.0 g of water at an initial temperature of 25.008C. After dissolu
jekas [21]

Answer:

Explanation:

mass of the solution m = 1.6 + 75 = 76.6 g

fall in temperature = 25 - 23.34 = 1.66°C

heat absorbed = mass x specific heat x fall in temperature

= 76.6 x 1.66 x 4.18

= 531.5 J .

= .5315 kJ .

mol weight of ammonium nitrate = 80 g

heat absorbed by 1.6 g = .5315 kJ

heat absorbed by 80 g or one mole = 26.575 kJ

enthalpy change ΔH = +26.575 kJ

b )

enthalpy of hydration = 2630 kJ / mol

lattice energy = enthalpy of hydration + enthalpy change

= 2630 + 26.575

= 2656.575 kJ  .

7 0
3 years ago
Chose the statements that are TRUE from the list below Group of answer choices Ions exist alone in nature We add calcium carbona
kompoz [17]

Answer:

The first option is false, since limestone has a much more acidic pH than granite. The pH of limestone is between 3.5 and 5.0, while the pH of granite is generally around 4.8 and 5.6.

The second option is false. (Traditionally, lactic acidosis has been classified into two categories: type A and type B. Type A is the result of tissue hypoxia and type B occurs with normal tissue perfusion and a adequate global tissue oxygenation)

The third option is false.

In the fourth option we consider that it is true since the hydrofluoric acid is a weak acid. Hydrogen fluoride actually does dissolve quite freely in water, but the H 3 O + and F - ions are strongly attracted to each other and form the strongly bonded pair, H 3 O + · F -

Explanation:

The third option is considered false since the salts contain an acid and a basic part, where one works as an anion and the other as a cation against dissolution, that is why they are not one or the other, but both chemical characteristics make up the Salt.

There are more or less soluble salts than others, and in turn there are binary, quaternary, tertiary or simple salts.

Y como para contribuir más a la explicación, es importante recordar el grupo de los acidos se clasifica en dons grandes familias, en acidos debiles y fuertes.

Un alcalde ph mas debiles seran, por más tiempo cercano al valor ph: 7 esten menos acidificacion tendran, y cuanto más lejos de la neutralidad este es su numero de ph mas fuertes seran.

5 0
4 years ago
Points + Brainalist
Lorico [155]

Answer:

I think A it looks to be the answer

Explanation:

sorry if wrong

4 0
2 years ago
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