<span>Igneous rocks are those rocks that were formed through cooling and solidifying the molten materials. The best example for igneous rock is solid volcanic java. Lava are liquid that comes from a volcano, but once it is dried and solidify, it becomes a rock and called igneous rock.
Another example is the granite and basalt. And according to research igneous rock comes from the latin word ignis which means fire. Thus this says it all. From a liquid becomes a rock.

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7 0

4 years ago

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How many grams of C2H6 are needed to react with 54 grams of O2?

Dmitrij [34]

Answer:

Explanation:

in a combustion of ethane 2 moles of ethane react with 7 moles of O2

now no of moles in 54 gram of O2=mass/ molar mass

moles =54/32=1.7 moles

if 7 moles of O2 required 2 moles of ethane then 1.7 mole required=?

7 moles of O2=2 moles of C2H6

1.7 moles of O2=1.7*2/7=0.5 moles of C2H6

0.5 moles of C2H6 contain how much grams=?

mass= moles*molar mass=0.5*30=15

4 0

3 years ago

Repeated trials and replication are the same thing. <br><br> - True<br> - False

Sauron [17]

Answer:

false

Explanation:

get a good grade :)

4 0

3 years ago

A 33.6 mL solution of KCl has a mass of 27.29 g. After evaporating to dryness, the dry salt residues has a mass of 6.31 g. Calcu

bixtya [17]

For the molarity and the percentage of the mass of kcl are mathematically given as

%m/m = 23.1%, molarity = 3.38M

<h3>What is the molarity?</h3>

Generally, the equation for the percentage of the mass of kcl is mathematically given as

(mass of kcl/mass of solution)x 100

therefore

%m/m = (6.31/27.29)x100

%m/m = 23.1%

The molarity

(no of mol/ vol of sol)

molarity = 0.0846mol/0.0250 L

molarity = 3.38M

In conclusion, the molarity is given as

molarity = 3.38M