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sammy [17]
3 years ago
9

Explain how mass is conserved before and after the change

Chemistry
1 answer:
Lyrx [107]3 years ago
4 0
If the number of atoms stays the same no matter how they are rearranged, then their total weight stays the same. In all physical and chemical changes, the total number of atoms remains the same, hence when substances interact with one another, combine or break apart, the total weight of the system remains the same.
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A bumblebee helps plants reproduce by carrying pollen from a flower on one plant to a flower on another plant. Which reproductiv
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Answer:

cross pollination

Explanation:

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El desplazamiento de la Tierra alrededor del Sol se conoce como
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3 0
3 years ago
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If 0.40 mol of H2 and 0.15 mol of O2 were to react as completely as possible to produce H2O what mass of reactant would remain?
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Answer : The mass of reactant H_2 remain would be, 0.20 grams.

Solution : Given,

Moles of H_2 = 0.40 mol

Moles of O_2 = 0.15 mol

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First we have to calculate the limiting and excess reagent.

The balanced chemical reaction is,

2H_2+O_2\rightarrow 2H_2O

From the balanced reaction we conclude that

As, 1 mole of O_2 react with 2 mole of H_2

So, 0.15 moles of O_2 react with 0.15\times 2=0.30 moles of H_2

From this we conclude that, H_2 is an excess reagent because the given moles are greater than the required moles and O_2 is a limiting reagent and it limits the formation of product.

The moles of reactant H_2 remain = 0.40 - 0.30 = 0.10 mole

Now we have to calculate the mass of reactant H_2 remain.

\text{ Mass of }H_2=\text{ Moles of }H_2\times \text{ Molar mass of }H_2

\text{ Mass of }H_2=(0.10moles)\times (2g/mole)=0.20g

Therefore, the mass of reactant H_2 remain would be, 0.20 grams.

3 0
4 years ago
How many minutes in 5 years? Please show work
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How much do 7.83 × 10^22 molecules of water weigh? Answer in units of g.
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<span>The answer I think is, 7.83E22.</span>
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3 years ago
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