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3 years ago

It is defined as the number of particles per mole of a substance. *

Chemistry

1 answer:

luda_lava [24]3 years ago

7 0

Answer:

Avogadro's number

Explanation:

Avogadro's number

defined as the number of elementary particles (molecules, atoms, compounds, etc.) per mole of a substance. It is equal to 6.022×1023 mol-1 and is expressed as the symbol NA.

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Upon combustion, a compound containing only carbon and hydrogen produces 2.67 g<img src="https://tex.z-dn.net/?f=CO_%7B2%7D" id=

Hoochie [10]

Answer:

$\boxed{\text{CH$_{2}$}}$

Explanation:

1. Calculate the mass of each element

$\text{Mass of C} = \text{2.67 g } \text{CO}_{2}\times \dfrac{\text{12.01 g C}}{\text{44.01 g }\text{CO}_{2}}= \text{0.7286 g C}\\\\\text{Mass of H} = \text{1.10 g }\text{H$_{2}$O}\times \dfrac{\text{2.016 g H}}{\text{18.02 g } \text{{H$_{2}$O}}} = \text{0.1231 g H}$

2. Calculate the moles of each element

$\text{Moles of C = 0.7286 g C}\times\dfrac{\text{1 mol C}}{\text{12.01 g C }} = \text{0.060 67 mol C}\\\\\text{Moles of H = 0.1231 g H} \times \dfrac{\text{1 mol H}}{\text{1.008 g H}} = \text{0.1221 mol H}$

3. Calculate the molar ratios

Divide all moles by the smallest number of moles.

$\text{C: } \dfrac{0.06067}{0.06067}= 1\\\\\text{H: } \dfrac{0.1221}{0.06067} = 2.015$

4. Round the ratios to the nearest integer

C:H = 1:2

5. Write the empirical formula

The empirical formula is $\boxed{\text{CH$_{2}$}}$

8 0

3 years ago

Fossil fuels are an important natural resource used by society. which of the following best describes fossil fuels? a. they are

ZanzabumX [31]

Fossil fuels are an important natural resource used by society and they are organic fuels derived from ancient plants and animals.

<h3>What are fossil fuels?</h3>

Fossil fuels are the natural resources means they are derived from the ancient resdue of plants and animale due to theor decomposition under high temperature and pressure.

Fossil fuel may be present in solid, liquid as well as in gaseous form so the given option (a) is incorrect.
This is the wrong assumption that in the fossil fuel we get the fossils of dinosaur, so option (c) is incorrect.
They are not inorganic fuels infact they are organic fuels.

So, fossil fuels are organic fuels derived from ancient plants and animals.

3 0

2 years ago

Read 2 more answers

Guys help me Please

nignag [31]

Answer:

8.38×10raise to power 23

Explanation:

mass of sugar=density ×volume

=. 1.59g/ml×25ml=39.75

no. of miles= given mass/ molar mass

= 39.75/342.3g / mole

1 mole of sugar =C12 H22 O11

contains

12× 6.023 × 10 ∆23=72.28× 10∆ 23 ×6.023×10²³

= 8.38× 10²³

4 0

3 years ago

What stage in the rock cycle is between metamorphic rock and igneous rock

mr Goodwill [35]

Answer:

sedimentary rock

Explanation:

Because there are three stages, first igneous rock changes into either sedimentary rock or meatamorphic rock.

4 0

3 years ago

An independent variable is....

Irina18 [472]

Answer:

B - What we change

Explanation:

Dependent Variable - What we measure

Control Variable - what stays the same

Conclusion - what we conclude

Hope this can Help!

:D

5 0

3 years ago