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e-lub [12.9K]
4 years ago
9

What is the mass of the polypropylene in grams? Assume that 1 lbs = 453.952 grams. Drag and drop the

Chemistry
1 answer:
Rudik [331]4 years ago
7 0

Answer:

7.50×10¯² lbs = 7.50×10¯² lbs × 453.952 g / 1 lbs

7.50×10¯² lbs = 34.0464 g.

Explanation:

From the question given, the following data were obtained:

1 lbs = 453.952 g

7.50×10¯² lbs =.?

Thus, we can obtain convert 7.50×10¯² lbs to grams as follow:

1 lbs = 453.952 g

Therefore,

7.50×10¯² lbs = 7.50×10¯² lbs × 453.952 g / 1 lbs

7.50×10¯² lbs = 34.0464 g

Therefore, 7.50×10¯² lbs is equivalent to 34.0464 g.

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In the following reaction, how many grams of NaBr will produce 244 grams of NaNO3? Pb(NO3)2(aq) 2 NaBr(aq) PbBr2(s) 2 NaNO3(aq)
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Answer : The mass of NaBr is, 295.323 grams

Solution :

First we have to calculate the moles of NaNO_3.

\text{Moles of }NaNO_3=\frac{\text{Mass of }NaNO_3}{\text{Molar mass of }NaNO_3}=\frac{244g}{85g/mole}=2.87moles

Now we have to calculate the moles of NaBr.

The balanced chemical reaction is,

Pb(NO_3)_2(aq)+2NaBr(aq)\rightarrow PbBr_2(s)+2NaNO_3(aq)

From the balanced reaction we conclude that

As, 2 moles of NaNO_3 react with 2 moles of NaBr

So, 2.87 moles of NaNO_3 react with 2.87 moles of NaBr

Now we have to calculate the mass of NaBr.

\text{Mass of }NaBr=\text{Moles of }NaBr\times \text{Molar mass of }NaBr

\text{Mass of }NaBr=(2.87mole)\times (102.9g/mole)=295.323g

Therefore, the mass mass of NaBr is, 295.323 grams

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