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3 years ago

What is the density of an unknown object with a mass of 225g and a volume of 500cm3

Chemistry

1 answer:

andrezito [222]3 years ago

3 0

Answer:

0.45 g/cm3

Explanation:

Density = Mass/Volume

225g/500cm3=0.45cm3

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The molar mass of copper(II) chloride (CuCl2) is 134. 45 g/mol. How many formula units of CuCl2 are present in 17. 6 g of CuCl2?

Nesterboy [21]

The number of formula units in the 17.6 g copper (II) chloride sample is $7.88\;\times\;10^2^2$ option A is correct.

The formula unit is given as the molecule of the compound with constituent atoms and bonds.

<h3>Computation for the number of formula units</h3>

The number of formula units in a mole of sample is equal to the Avogadro number. The Avogadro number is a constant with the value of $6.023\;\times\;10^2^3$ .

Thus, the number of formula units in copper (II) chloride are:

$\rm 1\;mol=6.023\;\times\;10^2^3\;formula\;unit\\134.45\;g/mol=6.023\;\times\;10^2^3\;formula\;unit$

The given mass of copper chloride is 17.6 g. The number of formula units is given as:

$\rm 134.45\;g=6.023\;\times\;10^2^3\;units\\\\17.6\;g=\dfrac{6.023\;\times\;10^2^3}{134.45}\;\times\;17.6\;units\\\\ 17.6\;g=7.88\;\times\;10^2^2\;units$

The number of formula units in the 17.6 g copper (II) chloride sample is $7.88\;\times\;10^2^2$ units.

Thus, option A is correct.

Learn more about formula units, here:

brainly.com/question/19293051

6 0

2 years ago

If you have one mole of alumibum atoms, what would the mass be

Irina18 [472]

Aluminum has a molar mass of 27. So one mole of aluminum is 27grams

6 0

2 years ago

Consider the chemical equation for the production of water: 2 H2+O2→2 H2O. If 100 grams of oxygen gas are used, what would the p

Cerrena [4.2K]

Answer:

The percentage yield of water is 66.67%.

Explanation:

$2H_2+O_2\rightarrow 2H_2O$

Mass of oxygen gas = 100 g

Moles of oxygen gas = $\frac{100 g}{32 g/mol}=3.125 mol$

According to reaction, 1 mole of oxygen gives 2 moles of water, then 3.125 moles of oxygen will give:

$\frac{2}{1}\times 3.125 mol=6.25 mol$

Mass of 6.25 moles of water :

6.25 mol × 18 g/mol = 112.5 g

Theoretical yield of water = 112.5 g

Experimental yield of water = 75 g

Percentage yield :

$=\frac{\text{Experimental yield}}{\text{Theoretical yield}}\times 100$

$=\frac{75 g}{112.5 g}\times 100=66.67\%$

The percentage yield of water is 66.67%.

4 0

2 years ago

I need help i dont get it first question

Elena L [17]

Answer:

Refinement

Explanation:

The 3R's policy was fundamentally introduced to safeguard the animals from harsh experiments which could change their mental and physical abilities and lead to their extinction one day.

The principles of 3R's (Replacement , Reduction and Refinement) were developed long time ago. It is an strategy to perform more Humane animal research.

These are defined as,

Replacement is a method to avoid or replace the uses of animals.

Reduction is a method to minimize the number of animals used every experiment.

Refinement is a method of minimizing animal suffering and improving welfare.

4 0

3 years ago

Which color???????<br> please help

Sholpan [36]

Answer:violet

Explanation:Even though violet waves have the shortest wavelength of the visible light spectrum, they carry the most energy.

4 0

2 years ago