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3 years ago

Dana wants to determine the molar mass of magnesium hydroxide, Mg(OH)2. Which calculation should she use?

Chemistry

2 answers:

AVprozaik [17]3 years ago

7 0

Answer:

C is correct

Explanation:

The molar mass is the total mass of a compound, that means, you need to add the mass of every single atom in the formula. In this case, you have one atom of Magnesium, two atoms of Oxygen and two atoms of Hydrogen, that is the reason why you need to multiply molar mass x 2 in the case of Oxygen and Hydrogen

aleksandr82 [10.1K]3 years ago

3 0

Answer C. is correct:

(molar mass of Mg) + (2 x molar mass of O) + (2 x molar mass of H)

:-) ;-)

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FrozenT [24]

Answer:

Kb = 1.6*10^-6

Explanation:

The given reaction is:

$N2H4(aq)+H2O(l)\rightarrow N2H5+(aq)+OH-(aq)$

The ionization constant of the base Kb is given as:

$Kb = \frac{[N2H5+][OH-]}{[N2H4]}------(1)$

The pH = 10.66

therefore, pOH = 14-pH = 14-10.66 =3.34

$[OH-] = 10^{-pOH} =10^{-3.34} =4.57*10^{-4} M$

[N2H5+] = [OH-] = 4.57*10^-4M

[N2H4] = 0.133 M

Based on eq(1)

$Kb = \frac{[4.57*10^{-4}]^{2}}{[0.133]}=1.6*10^{-6}$

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3 years ago

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3 years ago

Calculate the mass, in grams, of a single xenon atom (mxe = 131.29 amu ).

Mariana [72]

Answer is $2.18017\times10^{-22}gms$ .

Explanation: To calculate the mass of 1 Xe-atom , we will require atomic mass of Xe which is 131.29amu.

This atomic mass is the mass of 1 mole of 1 Xe-atom. One mole of Xe-atom is $6.022\times10^{23}$ atoms of Xe. We will use this relation to convert Mass of Xe-atom into grams.

$\frac{\text{mass of 1 atom}}{atom}=\frac{\text{mass of 1 mole of atom}}{6.022\times10^{23}atoms}$

$\text{mass of 1 atom}=\frac{\text{mass of 1 mole of atom}}{6.022\times10^{23}}$

$\text{mass of 1 Xe-atom}=\frac{131.29}{6.022\times10^{23}}$

$\text{mass of 1-Xe atom}=21.8017\times10^{-23}gms$

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3 years ago

Catie set a glass of hot water and a glass of cold water on the kitchen table and let them sit for one hour. How will the partic

Elis [28]

Answer:

C.The particles in the hot water will slow down, while the particles in the cold water will speed up

Explanation:

Heat causes changes in the molecules of substances when applied to them. The molecules of water, as a case study used in this question, when heated has an increased kinetic energy which causes its particles to move faster i.e. speed up. Also, when water is freezed or cold, it's particles move slower i.e. slow down due to decreased kinetic energy.

Hence, when a hot glass of water and a cold glass of water are placed on a kitchen table for 1 hour, they don't remain in their respective thermal state.

- The hot water (with an increased movement of molecules) begin to cool down, hence, its particles slows down as it gets cold or less hot.

- Likewise, the cold water (with a decreased movement of molecules) begins to get warmer, hence, it particles speedens up as it gets warmer.

Therefore, The particles in the hot water will slow down, while the particles in the cold water will speed up

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3 years ago

Drag each tile to the correct location.

Lapatulllka [165]

Answer: The rate of the forward reaction increases.+The concentration of

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Explanation: I got this right on Edmentum.

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