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3 years ago

Can somebody please help me ! :(

Chemistry

2 answers:

avanturin [10]3 years ago

8 0

Answer:

325

Explanation:

Helen [10]3 years ago

5 0

Answer:

325

Explanation:

velocity = 3250 Hz x 0.1 m

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Serggg [28]

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For the complete combustion of 47 g of gasoline (octane, C8H18) , the mass of oxygen consumed is

aleksklad [387]

Answer: d) 164.9 g

Explanation:

To calculate the moles :

$\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}$ $\text{Moles of octane}=\frac{47g}{114g/mol}=0.412moles$

The balanced chemical reaction is:

$2C_8H_{18}(l)+25O_2(g)\rightarrow 16CO_2(g)+18H_2O(g)$

According to stoichiometry :

2 moles of $C_8H_{18}$ require = 25 moles of $O_2$

Thus 0.412 moles of $C_8H_{18}$ will require= $\frac{25}{2}\times 0.412=5.15moles$ of $O_2$

Mass of $O_2=moles\times {\text {Molar mass}}=5.15moles\times 32g/mol=164.9g$

Thus 164.9 g of oxygen is consumed.

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3 years ago

1. Which is not true of binary compounds?

nignag [31]

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Choose the statement below that is TRUE. Question 7 options: The term "strong electrolyte" means that the substance is extremely

Setler [38]

Answer: A weak acid solution consists of mostly nonionized acid molecules.

Explanation:

Strong electrolytes are those solutions which undergo complete dissociation when dissolved in water. The dissociation of strong electrolytes is given by a right arrow.

Weak electrolytes are those solutions which do not undergo complete dissociation when dissolved in water. The dissociation of weak electrolytes is given by a rightleft arrow.

Weak acids are those substances which dissociate partially to give $H^+$ ions when dissolved in water. Thus most of molecules remain unionized in solutions.