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3 years ago

SCIENCEEEE!!!!! HELPPPP!!!!

Chemistry

2 answers:

Wittaler [7]3 years ago

7 0

Answer:

I would say Both are only physical changes.

Explanation:

Melting wax isn't creating a new substance, or changing the atomic structure. The wax is only changes from a solid to a liquid state. Sanding a piece if wood is usually done with sandpaper, which can physically be done with your hands. Hope this helped :)

IRINA_888 [86]3 years ago

5 0

pretty sure it's both are physical changes.

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What is the percent yield of ferrous sulfide if the actual yield is 220.0 g and the theoretical yield is 275.6 g?

BaLLatris [955]

<h2>Hello!</h2>

The answer is:

The third option, 79.8%

To calculate the percent yield we need to divide the actual yield by the theoretical yield, and then, multiply it by 100 in order to find the percent.

So, we from the statement we know the following information:

$ActualYield=220.0g\\TheoreticalYield=275.6g$

Let's use the following formula and substitute the given information:

$PercentYield=\frac{ActualYield}{Theoretical}*100\\\\$

$PercentYield=\frac{220g}{275.6g}*100=0.798*100=79.8(percent)$

Hence, we have that the correct option is the third option, the percent yield is 79.8%.

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3 years ago

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Answer:

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3 years ago

How many moles of sodium must react completely to produce 0.175 moles of sodium

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Answer:

You can view more details on each measurement unit: molecular weight of Sodium Nitrate or mol The molecular formula for Sodium Nitrate is NaNO3. The SI base unit for amount of substance is the mole. 1 grams Sodium Nitrate is equal to 0.011765443644878 mole.

Explanation:

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