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3 years ago

Identify the examples in which Sam interacts only with natural resources.

Chemistry

2 answers:

Elina [12.6K]3 years ago

7 0

Answer:

He took a deep breath and splashed some water on his face.

Explanation:

I took the test on Edmentum.

AlladinOne [14]3 years ago

3 0

Answer: He took a deep breath and splashed some water on his face.

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When hydrochloric acid is poured over potassium sulfide, 42.5 mL of hydrogen sulfide gas is produced at a pressure of 756 torr a

EastWind [94]

<h2>Answer:</h2> $0.1899grams$

<h2>Explanations:</h2>

The balanced chemical reaction between hydrochloric acid and potassium sulfide is as shown:

$K_2S+2HCl\to H_2S+2KCl$

Based on stoichiometry, we can see that 1 mole of potassium sulfide reacted to form 1 mole of hydrogen sulfide.

Get the mole of hydrogen sulfide gas (H2S) using the ideal gas equation expressed as:

$\begin{gathered} PV=\text{nRT} \\ n=\frac{PV}{RT} \end{gathered}$

P is the pressure of the gas (in atm) = 0.994737atm (756torr)

V is the volume of the gas = 42.5mL = 0.0425L

T is the temperature (in Kelvin) = 26 + 273 = 299K

R is the gas constant = 0.0821 L*atm/mole * K

Substitute these values into the formula as shown:

$\begin{gathered} n=\frac{0.994737\cancel{\text{atm}}\times0.0425\cancel{L}}{0.0821\frac{\cancel{L}\cdot\cancel{\text{atm}}}{\text{mole}\cdot\cancel{K}}\times299\cancel{K}} \\ n=\frac{0.994737\times0.0425}{0.0821\times299} \\ n=\frac{0.0422763225}{24.5479} \\ n=0.00172\text{moles} \end{gathered}$

Since the number of moles of hydrogen sulfide is 0.00172moles, the number of moles of potassium sulfide will also be 0.00172 moles (based on stoichiometry)

Get the mass of potassium sulfide that reacted using the formula:

$\text{Mass}=number\text{ of moles}\times molar\text{ mass}$

Number of moles of K2S = 0.00172 moles

Molar mass of K2S = 110.262 g/mol

Substitute into the formula for calculating the mass;

$\begin{gathered} \text{Mass}=0.00172\cancel{\text{moles}}\times\frac{110.262g}{\cancel{\text{mole}}} \\ \text{Mass}=0.1899\text{grams} \end{gathered}$

Therefore the mass of potassium sulfide that reacted (in grams) is approximately 0.1899grams

3 0

1 year ago

A horizontal row on the periodic table is called a______________________? Please help !!!!!!!!

ad-work [718]

Answer:

Period

Explanation:

horizontal is a period and verticle is a group

7 0

4 years ago

Read 2 more answers

Using your old and new reaction roadmaps as a guide, show how to convert ethane into 1- butanol. You must use ethane as the sour

Naddik [55]

Answer:

Ethane can be converted into 1- butanol in 4 different steps and reactions.

Explanation:

Step 1 : Ethane follows Markovnikov's rule and reacts with a protic acid called Hydrogen chloride to form Chloroethane.

Step 2: Chloroethane undergoes Wurtz reaction where it reacts with sodium metal in the presence of dry ether to form an higher alkane called butane.

Step 3: Butane undergoes chlorination where it reacts with an halogen called chlorine to form 1-chlorobutane.

Step 4: 1-chlorobutane reacts strong aqueous Potassium hydroxide (KOH) to form 1-butanol.

Attached to this answer is the handwritten conversion of Ethane to 1-butanol showing all the reagents and molecules synthesized along the way.

5 0

3 years ago

9. In a sample of gas, what causes pressure? Answer in a completesentence.

hammer [34]

Answer:

physical properties of gases, that is, pressure, volume, temperature, and amount of gas

7 0

4 years ago

On a 7 day wilderness expedition you'll need to heat 4.0kg of water to the boiling point each day. The air temperature will aver

max2010maxim [7]

Answer:

38 canisters

Explanation:

The combustion of propane can be represented by the equation below:

C₃H₈ (g) + O₂ (g) → CO₂ (g) + H₂O(g) ΔHc = -103.85 kJ/mol

The boiling of water is represented below:

H₂O(l) → H₂O(g) ΔH = Q = mcΔT

The heat necessary to make water reach the boiling point is Q, which is calculated with the mass of water (m = 4.0 kg), its specif heat capacity ( c = 4.200 J/kg°C) and temperature variation (ΔT = 100 - 25)

Therefore, ΔH = Q = 4.0 kg x 4.200 kJ/kg°C x 75 °C

ΔH = Q = 1260.0 kJ

This is the amount of heat necessary to heat the water every day. Since the expedition will last 7 days, the total heat will be 8820 kJ

Now we need to calculate the amount of propane needed to generate this heat:

1 mol C₃H₈ _______ 103.85 kJ

X _______ 8820 kJ

x = 84.9 mol C₃H₈

1 mol C₃H₈ _____ 44 g

84.9 mol C₃H₈ ___ x

x = 3735.6 g

1 canister _____ 100 g C₃H₈

x _____ 3735.6 g

x = 37.3 canisters

The minimum number of fuel canisters I must bring is 38 canisters.

3 0

3 years ago