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3 years ago

How do we use natural resources?

2 answers:

7 0

We use natural resources by making food,fuel,light,heat,and examples such as:we use materials like iron and copper to make cooking pans

user100 [1]3 years ago

3 0

Answer:

We use natural resources to make food, fuel, and raw materials. We also use them for heat, light, and power. Hope this helps. :)

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The combustion of propane may be described by the chemical equation C 3 H 8 ( g ) + 5 O 2 ( g ) ⟶ 3 CO 2 ( g ) + 4 H 2 O ( g ) C

Kipish [7]

Answer: 72 grams of $O_2(g)$ are needed to completely burn 19.7 g $C_3H_8(g)$

Explanation:

According to avogadro's law, 1 mole of every substance weighs equal to molecular mass and contains avogadro's number $6.023\times 10^{23}$ of particles.

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

Putting in the values we get:

$\text{Number of moles}=\frac{19.7g}{44g/mol}=0.45moles$

$C_3H_8(g)+5O_2(g)\rightarrow 3CO_2(g)+4H_2O(g)$

According to stoichiometry:

1 mole of $C_3H_8$ requires 5 moles of oxygen

0.45 moles of $C_3H_8$ require= $\frac{5}{1}\times 0.45=2.25$ moles of oxygen

Mass of $O_2=moles\times {\text {Molar mass}}=2.25\times 32=72g$

72 grams of $O_2(g)$ are needed to completely burn 19.7 g $C_3H_8(g)$

7 0

3 years ago

if you obtain the powder of a mineral by rubbing a mineral on a porcelain plate, which property have u observed?

charle [14.2K]

you have observed streak :)

7 0

4 years ago

Read 2 more answers

Which pair of elements would most likely form a covalent bond

denpristay [2]

Answer:

Nonmetals and nonmetals tend to form covalent bonds.

P and S

Explanation:

5 0

3 years ago

Which of the following is a measure of the average kinetic energy of the particles in a substance?

Harrizon [31]

C. Temperature. The greater the temperature of a substance the greater the average kinetic energy of the particles that made up the substance.

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3 years ago

The image shows copper wire coiled around an iron nail and connected to a battery to create an electromagnet. Which will increas

Ulleksa [173]

A is the correct answer and this question should be in physics not chemistry

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3 years ago