3 years ago

Please help i have 2 min to complete

1 answer:

5 0

What’s the question

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MrRissso [65]

64: C
65: D because weathering is defined as rock being eroded/changed
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3 years ago

bearhunter [10]

Answer: 28.4 g of aluminum oxide is produced by the reaction of 15.0 g of aluminum metal

Explanation:

To calculate the moles :

$\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}$

$\text{Moles of} Al=\frac{15.0g}{27g/mol}=0.556moles$

The balanced chemical equuation is:

$4Al+3O_2\rightarrow 2Al_2O_3$

According to stoichiometry :

4 moles of $Al$ produce == 2 moles of $Al_2O_3$

Thus 0.556 moles of $Al$ will produce= $\frac{2}{4}\times 0.556=0.278moles$ of $Al_2O_3$

Mass of $Al_2O_3=moles\times {\text {Molar mass}}=0.278moles\times 102g/mol=28.4g$

Thus 28.4 g of aluminum oxide is produced by the reaction of 15.0 g of aluminum metal.

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3 years ago

Vlada [557]

When it has sunlight and water

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3 years ago

weeeeeb [17]

Answer:

Acceleration is defined as the rate of change for velocity.

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4 years ago

mamaluj [8]

Number 1: (A.)
Number 2: (A.)
Number 3: (B.)

I'm probably wrong but that is what i think

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3 years ago