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3 years ago

The density is 5.4 g/mL and the volume is 12.9 mL.

Chemistry

1 answer:

marishachu [46]3 years ago

5 0

Answer:

69.66 g

Explanation:

We have the following from the question;

Density of the substance = 5.4 g/ml

Volume of substance = 12.9 ml

Mass of substance= the unknown

Since we have both density and volume of the substance, the question must be for us to obtain the mass of the substance, hence;

Density= mass/volume

Mass= Density × volume

Mass = 5.4 g/ml × 12.9 ml

Mass= 69.66 g

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3 years ago

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3 years ago

What mass of limestone (in kg) would be required to completely neutralize a 15.5 billion-liter lake that is 1.7×10^−5 M in H2SO4

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So we see that 1 mole of CaCO3 is needed for 2 moles of HNO3 and similarly to 1 mole of H2SO4.
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So the total moles of CaCO3 required is:

moles CaCO3 = 263,500 mol * 1 + 137,950 mol * (1/2)

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The molar mass of CaCO3 is 100.086 g/mol, so the mass is:

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5 0

4 years ago

Ted and Emily played a mixed doubles tennis match against Jack and Brenda. In the second match, Ted and Brenda played against Ja

timofeeve [1]

Answer:

Double replacement.

Explanation:

Chemical Reactions => Double Replacement Reactions.

Let's call Ted as T, Emily as E, Jack as J, and Brenda as B.

In the first match, we have T and E playing against J and B; and in the second match, we have T and B playing against J and E. We can state a 'reaction' of this if the first match would be the reactants and the second match the products:

$TE+JB\rightarrow TB+JE.$

You can note that this is similar to a double replacement reaction, remember that a double-replacement reaction is a reaction in which the positive and negative ions of two ionic compounds exchange places to form two new compounds. The general form of a double-replacement reaction is:

$AB+CD\rightarrow AD+BC,$

which is similar to the reaction of the game, so the answer would be Double replacement.

8 0

1 year ago