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Gelneren [198K]
3 years ago
14

The acid-dissociation constant, Ka, for benzoic acid is 6.5 × 10-5.

Chemistry
2 answers:
lina2011 [118]3 years ago
5 0
The correct anwerr is d
Gala2k [10]3 years ago
5 0
The correct answer of this one would be 1.5 x 10-10 
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What does (I) means in a chemical equation
Svetllana [295]

Answer:

the l sign means the substance in the chemical equation is a liquid. (hope this helped : D )

6 0
3 years ago
The Molar Mass (g/mol) of an ideal gas whose density is 2.5g/L at 1.8 atm and 30,0 Celsius ?
tia_tia [17]

Answer:

M = 35 g/mol

Explanation:

Given data:

Density = 2.5 g/L

Pressure = 1.8 atm

Temperature = 30°C (273.15 +30 = 303.15 K)

Molar mass = ?

Solution:

d = PM/RT

M = dRT/P

M =  2.5 g/L × 0.0821 atm.L/mol.K ×  303.15 K / 1.8 atm

M = 62.22 atm. g/mol/ 1.8 atm

M = 35 g/mol

8 0
2 years ago
A mixture of gaseous reactants is put into a cylinder, where a chemical reaction turns them into gaseous products. The cylinder
Zina [86]

a)Exothermic

b) it goes up

c) The piston must move out

d)The energy is released by the system

e)ΔE = -616 kJ

Explanation:

sign convention for heat flow:

if the heat flows into the system it is marked with positive sign

when the heat flows out the system it is marked with negative sign

sign convention for work

if work is done on the system it is marked positive

if work is done by the system it is marked negative

sign convention for internal energy

if energy absorbed by system mark positive

if energy released by system mark negative

a)

the heat flow flowing out of the system (q= -300 kJ)

thus the reaction is Exothermic

b)

In exothermic reaction, heat flows from the system to surroundings.

surrounding here is water bath.

As the system is exothermic, hence the temperature of water bath goes up

c)

It is given that 316 kJ of work is done by the system, applying expansion.

To maintain constant pressure of 1 atm the decreased pressure can be compensated with an increase on volume . To increase volume the piston must move out

d)

According to 1st law of thermodynamics,

ΔE =q +w            ⇒1

here,

ΔE = q +w  

ΔE =  -300 kJ -316 kJ

ΔE = -616 kJ          ⇒2

the negative sign denotes the energy is released by the system

e)

from ΔE = -616 kJ   the amount of energy released by the reaction is ΔE = -616kJ  

7 0
3 years ago
Will mark brainliest!
True [87]

Answer: 4. Two forms of single genes

Explanation:

Two different forms of a single gene are called 'alleles'.

3 0
3 years ago
In one paragraph, explain the movement of energy during phase transitions.
djverab [1.8K]

Phase transitions is when a substance go through a change in its physical state, for example, solid to liquid, liquid to gas, etc. Energy in this case must be absorbed or released, and not necessarily it will be seen a change of temperature in this case. Mathematically, we calculate the energy released or absorbed by using the molar enthalpy of vaporization or molar enthalpy of fusion, as we can see in the following formulas:

ΔH = m*ΔHvap

ΔH = m*ΔHfusion

So phase transition is the energy required for a substance to change the physical state.

4 0
1 year ago
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