Which of Graphs 1 correctly represents the relationship between the pressure and volume of a gas?

How much energy is needed to vaporize 75.0 g of diethyl ether (c4h10o) at its boiling point (34.6°c), given that δhvap of diethy

malfutka [58]

Answer: 26.8 kJ of energy is needed to vaporize 75.0 g of diethyl ether

Explanation:

First we have to calculate the moles of diethyl ether

$\text{Moles of diethyl ether}=\frac{\text{Mass of diethyl ether}}{\text{Molar mass of diethyl ether}}=\frac{75.0g}{74g/mole}=1.01moles$

As, 1 mole of diethyl ether require heat = 26.5 kJ

So, 1.01 moles of diethyl ether require heat = $\frac{26.5}{1}\times 1.01=26.8kJ$

Thus 26.8 kJ of energy is needed to vaporize 75.0 g of diethyl ether

5 0

4 years ago

Although coal is a complex mixture of substances, its elemental composition can be approximated by the formula <img src="https:/

Svetllana [295]

Answer:

The correct answer is option b.

Explanation:

$2C_{135}H_{96}O_9NS+313O_2\rightarrow 270CO_2+2NO_2+2SO_2+96H_2O$

Mass of coal burned = $1.00\times 10^6$ metric ton = 1.00\times 10^6\times 10^3 kg=10^9 kg[/tex]

1 metric ton = $10^3kg$

Molar mass of coal :

$135\times 12g/mol+96\times 1g/mol+9\times 16 g/mol+1\times 14 g/mol+1\times 32 g/mol=1906 g/mol=1.906 kg/mol$

1 g = 0.001 kg

Moles of coal ,n : $\frac{10^9 kg}{1.906 kg/mol}=5.247\times 10^8 mol$

If 2 moles of coal on combustion gives 270 moles of carbon dioxide than n moles of coal will give;

$5.247\times 10^8 mol\times \frac{270}{2}=7.083\times 10^{10} mol$ of carbon dioxide.

Molar mass of carbon dioxide gas = 44 g/mol = 0.044 kg/mol

Mass of $7.083\times 10^{10} mol$ of carbon dioxide:

$7.083\times 10^{10} mol\times 0.044 kg/mol=3.11\times 10^{11} kg$

5 0

4 years ago

If you have 35 ml of gas in a closed container under 1.23 atm of pressure, what will the volume be if the pressure increased to

Over [174]

Answer:

New volume is 14.35 mL

Explanation:

When a system of a gas keeps on constant its temperature and number of moles, the pressure is modified indirectly proportional to the volume:

Pressure increased → Volume decreased

Pressure decreased → Volume increased.

The relation you have to apply is: P₁ . V₁ = P₂. V₂

1.23 atm . 35 mL = 3 atm . V₂

(1.23 atm . 35 mL / 3 atm) = V₂

V₂ = 14.35 mL

5 0

3 years ago

Read 2 more answers

Urgent!!! Need answers!!!!??

vampirchik [111]

Answer:

Explanation:

What is the identity of the atom shown?

Answer:

Chlorine

Explanation:

An atom consist of electron, protons and neutrons. Protons and neutrons are present with in nucleus while the electrons are present out side the nucleus.

All these three subatomic particles construct an atom. A neutral atom have equal number of proton and electron. In other words we can say that negative and positive charges are equal in magnitude and cancel the each other. For example if neutral atom has 6 protons than it must have 6 electrons. The sum of neutrons and protons is the mass number of an atom while the number of protons are number of electrons is the atomic number of an atom.

In given picture it can be seen that there are 17 protons and 18 neutrons are present with in nucleus it means atomic mass is 35 amu and 17 electrons are present out side the nucleus it means its atomic number of 17.

The atomic number of chlorine is 17 and mass number is 35.5 amu thus the given atom is of chlorine.

Elements in the same group/family of the periodic table are similar in what way?

Answer:

D. They have the same number of valence electrons.

Explanation:

The elements in the same group have similar properties due to same number of valance electrons. For example

Consider the group two. It is alkaline earth metals's group. It consist of six members Beryllium, Magnesium, Calcium, Strontium, Barium and radium. All these have two valance electrons.

Electronic configuration of Beryllium:

Be = [He] 2s²

Electronic configuration of Magnesium:

Mg = [ Ne] 3s²

Electronic configuration of Calcium:

Ca = [Ar] 4s²

Electronic configuration of Strontium:

Sr = [Kr] 5s²

Electronic configuration of Barium:

Ba = [ Xe] 6s²

Electronic configuration of radium:

Ra = [Rn] 7s²

7 0

4 years ago

A(n)____ is a negatively-charged subatomic particle.<br> Help plz I need this before tmr morning

katrin [286]

the answer is electron

6 0

4 years ago