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2 years ago

Please helpp!! I give brainliest!

Chemistry

2 answers:

guajiro [1.7K]2 years ago

8 0

Answer:

Volume is cut in half

Explanation:

• From boyles gas law

${ \rm{P \: \alpha \: \frac{1}{V} }} \\ \\ { \rm{P _{1}V _{1} = P_{2}V _{2} }}$

P is pressure
V is volume

${ \rm{(1 \times V _{1}) = (2 \times V _{2})}} \\ \\ { \rm{ \frac{V _{2}}{V_{1}} = \frac{1}{2} }} \\ \\ { \boxed{ \rm{V_{2} : V _{1} = \frac{1}{2} }}}$

ANEK [815]2 years ago

4 0

Answer:

just because of the air

Explanation:

big / the answer is volume stays the same

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Look at the following chemical compounds. State how many molecules of each reactant are present. (I’m sorry I’ve been working on

Kryger [21]

$▪▪▪▪▪▪▪▪▪▪▪▪▪ {\huge\mathfrak{Answer}}▪▪▪▪▪▪▪▪▪▪▪▪▪▪$

<h3>Compound ~ $\mathrm{NaOH}$ </h3>

Na = 1

O = 1

H = 1

<h3>Compound ~ $\mathrm{CO_2}$ </h3>

C = 1

O = 2

<h3>Compound ~ $\mathrm{3 \: CaO}$ </h3>

Ca = 3

O = 3

<h3>Compound ~ $\mathrm{2 MgCl_2}$ </h3>

Mg = 2

Cl = 4

7 0

3 years ago

Please somebody give me the answers

RSB [31]

Answer:

1. 9.4 grams of methane produce<u> 25.85</u> grams of CO2

2.Grams of water produced = <u>11.81 grams</u>

3.Mass of Methane produced by 10.1 gram of O2 = <u>2.52 grams</u>

4.Amount of methane consumed = <u>46.9 grams</u>

5. Grams of Co2 produced =<u> 8.32 grams</u>

<u></u>

Explanation:

Molar masses :

Methane = CH4 = mass of C + 4x (mass of H)

CH4 = 12 +4(1) = 16 grams

Oxygen O2 = 2 x (mass of O) = 2x(16) = 32 gram (1 mole of O2 =32 gram)

Carbon Dioxide =CO2 = mass of C + 2(mass of O)

= 12 + 2(16)

= 44 grams <u>(1 mole of CO2 = 44 gram )</u>

Water = H2O = 18 grams ( 1 mole of H2O = 18 gram)

1 mole of each molecule is equal to their molar masses

The balanced equation is :

$1CH_{4}(g)+2O_{2}\rightarrow 1CO_{2}+2H_{2}O(l)$

According to Stoichiometry :

1 mole of CH4 = 2 Mole of O2 = 1 mole of CO2 = 2 mole of H2O

1. From the equation ,

1 mole of methane produce =1 mole of CO2

16 gram of methane = 44 gram of CO2

1 gram of methane =

$\frac{44}{16}$ gram of CO2

9.4 gram of CH4 =

$\frac{44}{16}\times 9.4$ gram of CO2

= 25 .85 gram of CO2

2 mole of O2 produces = 2 mole of H2O(water)

1 mole of O2 produces = 1 mole of H2O

32 gram of O2 = 18 gram of water

1 gram of O2 =

$\frac{18}{32}$

21 gram of O2 =

$\frac{18}{32}\times 21$

11.81 gram of water

3. 1 mole of CH4 = 2 mole of O2

16 gram of CH4 = 2(32) = 64 grams of O2

64 gram of O2 needs = 16 grams of CH4

1 gram of O2 needs =

$\frac{16}{64}$

10.1 gram of O =

$\frac{16}{64}\times 10.1$ of CH4

= 2.52 gram

1 mole of CO2 is produced from = 1 mole of CH4

44 gram of CO2 is produced from 16 gram of CH4

1 gram CO2 =

$\frac{16}{44}$ gram of CH4

129 gram of CO2 =

$\frac{16}{44}\times 129$ gram of CH4

= 46.90 grams

2 mole of O2 produce = 1 mole of CO2

2x 32 gram of O2 = 44 gram of CO2

1 gram of O2 =

$\frac{44}{64}$ of CO2

12.1 gram of O2 produce=

$\frac{44}{64}\times 12.1$ of CO2

= 8.318 gram

Note : Write the quantity give on left side of "="

write the substance asked on right side of "="

8 0

3 years ago

1. Which change of state is accompanied by the removal of heat energy

Alja [10]

H⁣⁣⁣⁣ere's l⁣⁣⁣ink t⁣⁣⁣o t⁣⁣⁣he a⁣⁣⁣nswer:

bit. $^{}$ ly/3a8Nt8n

4 0

3 years ago

Matter and energy may be created or destroyed in a chemical reaction.

gulaghasi [49]

Answer:false

Explanation:matter cannot be created or destroyed in a chemical reaction it is rearranged

3 0

3 years ago

Which process results in a chemical change?

Alla [95]

D) burning magnesium ribbon, as combustion is a chemical reaction so causes chemical change. The other 3 options do not involve reactions so there isn't a chemical change.

5 0

3 years ago

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