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aalyn [17]
3 years ago
9

What is the density of an object with a mass of 7.92g and a volume of 3.25mL? 

Chemistry
1 answer:
Anarel [89]3 years ago
6 0
Hey there!

Using your density formula, D=M/V where D represents the density, M represents the mass, and V represents the volume, you can plug in your given values to find the density.

Knowing that your mass is 7.92 grams, and your volume is 3.25 mL, you can find the density by setting up this expression:
7.92/3.25

Now, simplify:
7.92/3.25
≈2.44

Therefore, your density of the object would be approximately 2.44 grams per mL.

Hope this helps and have a marvelous day! :)
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How many moles of KOH are required to produce 4.79 g K3PO4 according to the following reaction? 3KOH + H3PO4 -----> K3PO4 + 3
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Answer:

0.677 moles

Explanation:

Take the atomic mass of K = 39.1, O =16.0, P = 31.0

no. of moles = mass / molar mass

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= 0.02256 mol

From the equation, the mole ratio of KOH : K3PO4 = 3 :1,

meaning every 3 moles of KOH used, produces 1 mole of K3PO4.

So, using this ratio, let the no. of moles of KOH required to be y.

\frac{3}{1} =\frac{y}{0.02256} \\

y = 0.02256 x3

y = 0.0677 mol

If you don't find exactly 0.677 moles as one of the options, go for the closest one. A very slight error may occur because of taking different significant figures of atomic masses when calculating.

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