All categories

3 years ago

Someone please help me with this????

Chemistry

1 answer:

tensa zangetsu [6.8K]3 years ago

6 0

Answer:

D po ayan po ang sagot ko salamat po

You might be interested in

QUESTION 2

Aleksandr [31]

Answer:

you can see the answer at the pic

4 0

3 years ago

The neutralization of H 3 PO 4 with KOH is exothermic. H 3 PO 4 ( aq ) + 3 KOH ( aq ) ⟶ 3 H 2 O ( l ) + K 3 PO 4 ( aq ) + 173.2

Ratling [72]

Explanation:

It is known that,

No. of moles = Molarity × Volume

So, we will calculate the moles of $H_{3}PO_{4}$ as follows.

No. of moles = $0.227 \times 0.055 L$

= 0.0125 mol

Now, the moles of KOH are as follows.

No. of moles = $0.680 \times 0.055 L$

= 0.0374 mol

And, $3 \times \text{moles of} H_{3}PO_{4}$ = $3 \times 0.0125$

= 0.0375 mol

Now, the balanced reaction equation is as follows.

$H_{3}PO_{4}(aq) + 3KOH(aq) \rightarrow 3H_{2}O(l) + K_{3}PO_{4}(aq) + 173.2 kJ$

This means 1 mole of $H_{3}PO_{4}$ produces 173.2 kJ of heat. And, the amount of heat produced by 0.0125 moles of $H_{3}PO_{4}$ is as follows.

M = $\frac{0.0125 mol \times 173.2 kJ}{1}$

= 2.165 kJ

Total volume of the solution = (55.0 + 55.0) ml

= 110 ml

Density of the solution = 1.13 g/ml

Mass of the solution = Volume × Density

= $110 ml \times 1.13 g/ml$

= 124.3 g

Specific heat = 3.78 $J/g^{o}C$

Now, we will calculate the final temperature as follows.

q = $mC \times \Delta T$

2165 J = $124.3 \times 3.78 \times (T - 22.62)^{o}C$

2165 - 469.854 = $T - 22.62^{o}C$

17.417 = $T - 22.62^{o}C$

T = $40.04^{o}C$

Thus, we can conclude that final temperature of the solution is $40.04^{o}C$ .

3 0

3 years ago

The diaphragm adjusts the ____________ on a light microscope.

kykrilka [37]

Is used to vary the intensity and size of the cone of light that is projected upward into the slide

5 0

3 years ago

Read 2 more answers

A tank contains 651 L of compressed oxygen gas at a pressure of 122 atm at 25.0 degree C. What is the volume of the oxygen (in L

IgorC [24]

P1V1=P2V2

745 torr*1 atm/760 torr=0.980 atm

122 atm*651L=0.980 atm * x

x=(122 atm*651L)/0.980 atm =81042 L ≈ 81000 L=8.10*10⁴ L
8.10*10⁴ L is second answer looks like this?

4 0

3 years ago

is there any evidence that methanol forms ions either in the pure state or when dissolved in water? would you classify methanol

snow_lady [41]

Answer: There is no evidence that methanol form ions when in pure state or when dissolved in water. It is a nonelectrolyte.

Explanation:

Electrolytes are substances that dissociate in solution to form ions. This implies that they are composed of ions (ionic substances) or molecular species that readily dissociate ions such as water. Methanol does not dissociate into ions both in solution and in pure state hence it is a nonelectrolyte. It is purely a covalent compound that does not conduct electricity.

4 0

4 years ago