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3 years ago

13

WILL GIVE BRAINLIEST!!!

1 answer:

fiasKO [112]3 years ago

8 0

Answer:

combining wax

Explanation:

Candles burn through an efficient combustion process by combining wax, a poor conductor of heat that melts just above room temperature, with a wick, an absorbent material that will absorb liquid wax and transfer it toward the candles flame while its burning. when a candles wick is lit, the heat from above it. and I'm not a good explainer sorry if I got it wrong

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3 years ago

You dissolve 8.65 grams of lead(II) nitrate in water, and then you add 2.50 grams of aluminum. This reaction occurs: 2Al(s) + 3P

Marysya12 [62]

Answer: A. 5.41

Explanation:

To calculate the moles :

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

$\text{Moles of} Al=\frac{2.50g}{27g/mol}=0.0926moles$

$\text{Moles of} Pb(NO_3)_2=\frac{8.65g}{331g/mol}=0.0261moles$

$2Al(s)+3Pb(NO_3)_2(aq)\rightarrow 3Pb(s)+2Al(NO_3)_3(aq)$

According to stoichiometry :

3 moles of $Pb(NO_3)_2$ require = 2 moles of $Al$

Thus 0.0261 moles of $Pb(NO_3)_2$ will require= $\frac{2}{3}\times 0.0261=0.0174moles$ of $Al$

Thus $Pb(NO_3)_2$ is the limiting reagent as it limits the formation of product and $Al$ is the excess reagent.

As 3 moles of $Pb(NO_3)_2$ give = 3 moles of $Pb$

Thus 0.0261 moles of $Pb(NO_3)_2$ give = $\frac{3}{3}\times 0.0261=0.0261 moles$ of $Pb$

Mass of $Pb=moles\times {\text {Molar mass}}=0.0261moles\times 207g/mol=5.41g$

Thus 5.41 g of solid lead will be produced from the given masses of both reactants.

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3 years ago