Chemistry, 20.07.2021 06:50, kmontanab00

How many moles of Cd and of N are contained in 132.4 g of Cd(N03)2-4H20? (b) How many molecules of water of hydration are in this same amount?

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The given amount of Cd(NO_3)_2.4H_2O contains 0.430 moles of Cd, 0.860 moles of N and $2.59\times 10^{23}$ molecules of water.

Explanation:

The number of moles is defined as the ratio of the mass of a substance to its molar mass. The equation used is:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$ ......(1)

Given mass of Cd(NO_3)_2.4H_2O = 132.4 g

Molar mass of Cd(NO_3)_2.4H_2O = 308.5 g/mol

Plugging values in equation 1:

$\text{Moles of }Cd(NO_3)_2.4H_2O=\frac{132.4g}{308.5g/mol}=0.430 mol$

1 mole of Cd(NO_3)_2.4H_2O contains 1 mole of Cd, 2 moles of nitrogen atom (N), 10 moles of oxygen atom (O) and 8 moles of hydrogen atom (H).

So, 0.430 moles of Cd(NO_3)_2.4H_2O will contain = $(1\times 0.430) = 0.430mol$ of Cd and $(2\times 0.430)=0.86mol$ of N

According to the mole concept:

1 mole of a compound contains $6.022\times 10^{23}$ number of molecules

So, 0.430 moles of Cd(NO_3)_2.4H_2O will contain = $\frac{6.022\times 10^{23}}{1mol}\times 0.430mol=2.59\times 10^{23}$ number of water molecules.

Hence, the given amount of Cd(NO_3)_2.4H_2O contains 0.430 moles of Cd, 0.860 moles of N and $2.59\times 10^{23}$ molecules of water.

answered: Guest

out of these options:

ability to burn paper

pure sodium reacting violently with water

the boiling point of water

helium does not tend to react with anything

i would say this is a physical property:

helium does not tend to react with anything

why? :

i said helium does not tend to react with anything because well, it reacts to ! but ability to burn paper, pure sodium reacting violently with water, & the boiling point of water are chemical or

physical properties: the properties of a substance that can be observed without changing the chemical makeup of the substance

chemical properties: properties of a substance relating to the chemical nature and reactivity of the substance

answered: Guest

Mass is the amount of matter in an object. weight is the measurement of the pull of gravity on an object. say for example, you travel to the moon which has a different gravitational field compared to the gravitational field of earth. (gravitational fields: earth = 1, moon = 0.165) now when you are on the moon, the pull of gravity on you is different than on the earth. and as weight is the measurement of the pull of gravity on an object, that means yes, your weight can and will change on the moon. however, on the moon, on earth or even on jupiter, the amount of mass inside of you remains the same. meaning your physical mass remains constant. in conclusion it is possible for your weight to change as your mass remains constant.

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How many moles of Cd and of N are contained in 132.4 g of Cd(N03)2-4H20? (b) How many molecules of w...