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3 years ago

What does ozone do to make life on earth possible?

1 answer:

6 0

Answer - Ozone layer helps keep the harmful ultra violet rays hitting and keeping the atmospheric pressure in.

Reasoning - Without the ozone layer the whole planet would have a loss of water and especially people burning very easily from the sun.

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A 1.00 g sample of naphthalene (C10H8) contains 0.562 g of hydrogen. What is the mass percent of carbon in the compound?

chubhunter [2.5K]

Answer:

mass of carbon = 0.438g

Explanation:

mass percentage = 0.00438%

6 0

3 years ago

In a chemical reaction represented by the general equation A+ B = C + D, there are 4 distinct mole ratios that can be written. T

nydimaria [60]

So,

These species react stoichiometrically. Thus, we can say, for example, that 1 mol A is stoichiometrically equivalent to 1 mol B in this reaction. I will say A = B.

A = B

A = C

A = D

B = C

B = D

C = D

As you can see, there are more than 4 distinct mole ratios for this reaction. Thus, the statement is false.

6 0

4 years ago

Read 2 more answers

When did the Big Bang occur ?

scZoUnD [109]

13.8 billion years ago

This relic radiation is known as the cosmic microwave background radiation. The chemistry of life may have begun shortly after the Big Bang, 13.8 billion years ago, during a habitable epoch when the universe was only 10–17 million years old.

5 0

3 years ago

Read 2 more answers

Which is less reactive Chlorine or Potassium? Explain your answer. Thx

katen-ka-za [31]

The reactivity of the halogens increases the group. This is because chlorine is more reactive than bromine. However, if chlorine is bubbled through potassium bromide solution a displacement reaction occurs.

6 0

3 years ago

(a) The mass density of a gaseous compound was found to be 1.23 kg m^−3 at 330 K and 20 kPa. What is the molar mass of the compo

Luden [163]

Answer:

The molar mass of the compound is:- 168.82 g/mol

The molar mass of the gas is:- 16.38 g/mol

Explanation:

(a)

Using ideal gas equation as:

$PV=nRT$

where,

P is the pressure

V is the volume

n is the number of moles

T is the temperature

R is Gas constant having value = 0.0821 L.atm/K.mol

Also,

Moles = mass (m) / Molar mass (M)

Density (d) = Mass (m) / Volume (V)

So, the ideal gas equation can be written as:

$PM=dRt$

Given that:-

Pressure = 20 kPa = 20000 Pa

The expression for the conversion of pressure in Pascal to pressure in atm is shown below:

P (Pa) = $\frac {1}{101325}$ P (atm)

20000 Pa = $\frac {20000}{101325}$ atm

Pressure = 0.1974 atm

Temperature = 330 K

d = 1.23 kg/m³ = 1.23 g/L

Molar mass = ?

Applying the equation as:

0.1974 atm × M = 1.23 g/L × 0.0821 L.atm/K.mol × 330 K

⇒M = 168.82 g/mol

The molar mass of the compound is:- 168.82 g/mol

(b)

Given that:

Pressure = 152 Torr

Temperature = 298 K

Volume = 250 cm³ = 0.25 L

Using ideal gas equation as:

$PV=nRT$

R = $62.3637\text{torr}mol^{-1}K^{-1}$

Applying the equation as:

152 Torr × 0.25 L = n × 62.3637 L.torr/K.mol × 298 K

⇒n = 0.002045 moles

Given that :

Mass of the gas = 33.5 mg = 0.0335 g

Molar mass = ?

The formula for the calculation of moles is shown below:

$moles = \frac{Mass\ taken}{Molar\ mass}$

Thus,

$0.002045\ moles
= \frac{0.0335\ g}{Molar\ mass}$

The molar mass of the gas is:- 16.38 g/mol

5 0

3 years ago