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4 years ago

How many moles of Na2Cr2O7 contain 14 moles of oxygen atoms?

2 answers:

7 0

The number of moles of sodium dichromate from the number of moles of oxygen atoms can be determined through stoichiometry. Using the molecular formula of the compound, Na2Cr2O7, 1 mole of the compound contains 7 moles of oxygen. Hence, 14 moles O2*(1 mole Na2Cr2O7/ 7 mole O2) is equal to 2 moles Na2Cr2O7.

Taya2010 [7]4 years ago

4 0

Answer: The number of moles of the compound are 2 moles.

Explanation:

We are given:

Moles of oxygen atom = 14 moles

The chemical formula for the given compound is $Na_2Cr_2O_7$

In 1 mole of sodium dichromate, 2 moles of sodium atoms, 2 moles of chromium atoms and 7 moles of oxygen atoms are present.

To calculate the moles of compound, we use unitary method:

7 moles of oxygen atoms are present in 1 mole of sodium dichromate.

So, 14 moles of oxygen atoms will be present in $\frac{1}{7}\times 14=2mol$ of sodium dichromate.

Hence, the number of moles of the compound are 2 moles.

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3 years ago

What is the volume (in cubic inches) of 3.6 lb of titanium?

Monica [59]

Answer:

22 cubic inches

Explanation:

We are given;

Mass of titanium = 3.6 pounds

We are required to determine the volume of titanium in cubic inches

We need to know the density of titanium;

Density of titanium = 4.51 g/cm^3

1 pound = 453.592 g

therefore, 3.6 pound = (3.6 × 453.592 g per pound)

= 1632.93 g

Therefore;

Volume = Mass ÷ density

= 1632.93 g ÷ 4.51 g/cm^3

= 362.069 cm³

But, 1 in³ = 16.387 cm³

Therefore;

Volume = 362.069 cm³ ÷ 16.387 cm³ per in³

= 22.095 in³

= 22 in³

Thus the volume of titanium is 22 cubic inches

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3 years ago

What mass of NaCl is dissolved in 150 g of water in a .050 msolution?

mart [117]

Answer:

0.4383 g

Explanation:

Molality is defined as the moles of the solute present in 1 kg of the solvent.

It is represented by 'm'.

Thus,

$Molality\ (m)=\frac {Moles\ of\ the\ solute}{Mass\ of\ the\ solvent\ (kg)}$

Given that:

Mass of solvent, water = 150 g = 0.15 kg ( 1 g = 0.001 g )

Molality = 0.050 m

So,

$0.050=\frac {Moles\ of\ the\ solute}{0.15}$

$Moles = 0.050\times 0.15\ mol= 0.0075\ mol$

Molar mass of NaCl = 58.44 g/mol

Mass = Moles*Molar mass = $0.0075\times 58.44\ g$ = 0.4383 g

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4 years ago