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IrinaK [193]
3 years ago
7

A 2.75 kg sample of a substance occupies a volume of 250.0 cm3. Find its density in g/cm3.

Chemistry
2 answers:
Nikitich [7]3 years ago
8 0

Answer:

dsf

Explanation:

It is known that density is the amount of mass present in per liter of a substance.

Mathematically,    Density = \frac{mass}{volume}

It is given that mass is 2.75 kg or 2750 g (as 1 kg = 1000 g) and volume is 250 cm^{3}.  

Therefore, calculate the density of substance as follows.

                    Density = \frac{mass}{volume}

                                 = \frac{2750 g}{250 cm^{3}}

                                 = 11 g/cm^{3}

Thus, we can conclude that density of given substance is 11 g/cm^{3} .

satela [25.4K]3 years ago
5 0
Density is 0.011 g/cm3.
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An object has a density of 10.00 g/mL. If the object has a volume of<br> 25.00 ml, what is the mass?
SVEN [57.7K]

Answer:

The answer is

<h2>250 g</h2>

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

<h3>mass = Density × volume</h3>

From the question

volume of object = 25 mL

Density = 10 g/mL

The mass of the object is

mass = 25 × 10

We have the final answer as

<h3>250 g</h3>

Hope this helps you

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Calculate the ph of a 0.021 m nacn solution. [ka(hcn) = 4.9  10–10]
ohaa [14]

<span>Answer is: pH of solution of sodium cyanide is 11.3.
Chemical reaction 1: NaCN(aq) → CN</span>⁻(aq) + Na⁺<span>(aq).
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c(NaCN) = c(CN</span>⁻<span>) = 0.021 M.
Ka(HCN) =  4.9·10</span>⁻¹⁰<span>.
Kb(CN</span>⁻) = 10⁻¹⁴ ÷ 4.9·10⁻¹⁰ = 2.04·10⁻⁵<span>.
Kb = [HCN] · [OH</span>⁻] / [CN⁻<span>].
[HCN] · [OH</span>⁻<span>] = x.
[CN</span>⁻<span>] = 0.021 M - x..
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Answer:

Increasing the temperature of the reactants

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