Determine the molar mass of carbon dioxide (CO2)

How many molecules are in 24g of water

Sergio [31]

Answer:

A million one thousand

Explanation:

7 0

3 years ago

Why is air a renewable resource

slavikrds [6]

Because it something that we will never run out of

7 0

3 years ago

Which has a tetrahedral pyramidal molecular geometry?

xxMikexx [17]

Answer:

Sulfate = tetrahedral

Explanation:

N° Geometry Formula

2 linear AX2

3 trigonal-planar AX3 or AX2E

4 tetrahedral AX4/AX3E/AX2E2

a) Nitrate = NO3-

⇒ AX3

⇒ bond angles = 120°

⇒ Coordination number = 3

⇒ Trigonal planar

b) Sulfate = SO42-

The central S

-atom has four electron domains. It has no lone pairs, so the electron geometry and the molecular geometry are tetrahedral.

⇒AX4

⇒ bond angles = 190.5°

⇒Coordination number = 4

⇒Tetrahedral

c) Chlorate = ClO3-

In ClO3-, the central atom is a Chlorine.

It has 7 valence electrons. The three oxygen form a double bond giving three bond pairs. The remaining two electrons make a lone pair. The total of 4 electron pairs shows that the molecule is sp3 hybridised.

The shape of sp3 hybrid molecule is a tetrahedral. But there is a lone pair. So, the geometry is pyramidal.

⇒AX4

⇒ bond angles = 190.5°

⇒Coordination number = 3

⇒pyramidal

Diffference between tetrahedral and pyramidal is that tetrahedral no has a lone pair, and has 4 atoms bonded to the central atom, while pyramidal has 1 lone pair and 3 atoms bonded to the central atom.

Sulfate has a tetrahedral geometry, which is a pyramidal structure

5 0

3 years ago

When 1.2383 g of an organic iron compound containing Fe, C, H, and O was burned in O2, 2.3162 g of CO2 and 0.66285 g of H2O were

uysha [10]

Answer:

$\boxed{\text{C$_{15}$H$_{21}$FeO$_{6}$}}$

Explanation:

Let's call the unknown compound X.

1. Calculate the mass of each element in 1.23383 g of X.

(a) Mass of C

$\text{Mass of C} = \text{2.3162 g } \text{CO}_{2}\times \dfrac{\text{12.01 g C}}{\text{44.01 g }\text{CO}_{2}}= \text{0.632 07 g C}$

(b) Mass of H

$\text{Mass of H} = \text{0.66285 g }\text{H$_{2}$O}\times \dfrac{\text{2.016 g H}}{\text{18.02 g } \text{{H$_{2}$O}}} = \text{0.074 157 g H}$

(c)Mass of Fe

(i)In 0.4131g of X

$\text{Mass of Fe} = \text{0.093 33 g Fe$_{2}$O$_{3}$}\times \dfrac{\text{111.69 g Fe}}{\text{159.69 g g Fe$_{2}$O$_{3}$}} = \text{0.065 277 g Fe}$

(ii) In 1.2383 g of X

$\text{Mass of Fe} = \text{0.065277 g Fe}\times \dfrac{1.2383}{0.4131} = \text{0.195 67 g Fe}$

(d)Mass of O

Mass of O = 1.2383 - 0.632 07 - 0.074 157 - 0.195 67 = 0.336 40 g

2. Calculate the moles of each element

$\text{Moles of C = 0.63207 g C}\times\dfrac{\text{1 mol C}}{\text{12.01 g C }} = \text{0.052 629 mol C}\\\\\text{Moles of H = 0.074157 g H} \times \dfrac{\text{1 mol H}}{\text{1.008 g H}} = \text{0.073 568 mol H}\\\\\text{Moles of Fe = 0.195 67 g Fe} \times \dfrac{\text{1 mol Fe}}{\text{55.845 g Fe}} = \text{0.003 5038 mol Fe}\\\\\text{Moles of O = 0.336 40} \times \dfrac{\text{1 mol O}}{\text{16.00 g O}} = \text{0.021 025 mol O}$

3. Calculate the molar ratios

Divide all moles by the smallest number of moles.

$\text{C: } \dfrac{0.052629}{0.003 5038}= 15.021\\\\\text{H: } \dfrac{0.073568}{0.003 5038} = 20.997\\\\\text{Fe: } \dfrac{0.003 5038}{0.003 5038} = 1\\\\\text{O: } \dfrac{0.021025}{0.003 5038} = 6.0006$

4. Round the ratios to the nearest integer

C:H:O:Fe = 15:21:1:6

5. Write the empirical formula

$\text{The empirical formula is } \boxed{\textbf{C$_{15}$H$_{21}$FeO$_{6}$}}$

5 0

3 years ago

Any body help me? please Q 17

iVinArrow [24]

Question 17

The subscript 2 is the atomic number for helium and subscript 4 is the mass number for Helium

explanation

when writing down an isotope of an element the mass number of that isotope is written in upper side of the chemical symbol, while atomic number is written on the lower side.

Since 4 is on upper side it is the mass number of He, while 2 is the atomic number since it is on lower side.

Question 18

The type of radiation emitted when polonium -212 form lead 208 is an alpha particle

explanation

Alpha decay is a decay in which an atomic nuclei emit an alpha particles and be transformed into different atomic nuclei with a mass number that is reduced by 4

polonium 212 is reduced by 4 to form lead 208 therefore it undergo alpha particle decay.

8 0

4 years ago