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kirza4 [7]
3 years ago
11

What is the percent by mass (%m/m) concentration of ammonium hydroxide (nh4oh) in a solution prepared by dissolving 8.40 g nh4oh

in 94.60 g of h2o?
Chemistry
1 answer:
Gnom [1K]3 years ago
8 0
If you want to express the concentration in terms of percent mass, then you would have to divide the mass of solute to the mass of solution, then multiply it by 100.

Mass of solute = 8.40 g
Mass of solution = 8.40+94.60 = 103 g

Percent Mass = (8.40/103)*100 = <em>8.16%</em>
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Determine the molecular geometry based on the description of bonding and lone pairs of electrons around the central atom. Three
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Answer:

Three double bonds and no lone pairs of electrons- trigonal planar

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Five single bonds and no lone pairs of electrons- trigonal bipyramidal

Three single bonds and one lone pair of electrons- trigonal pyramidal

Two double bonds and no lone pairs of electrons - linear

Four single bonds and no lone pairs of electrons- tetrahedral

Six single bonds and no lone pairs of electrons- octahedral

Explanation:

The valence shell electron pair repulsion theory gives a description of the shape of a molecule based on the number of regions of electron density present on the valence shell of the central atom of the molecule.

The molecules are distorted away from the shape predicted on the basis of the VSEPR by the presence of lone pairs on the valence shell of the central atom in the molecule. In the absence of lone pairs, the shape of a molecule is exactly the shape predicted on the basis of the VSEPR theory.

5 0
3 years ago
a 108ml sampl of gas has a mass of 77.96mg at a pressure of 1140mmhg and temperature of 183°c .what is the molar mass of the gas
madam [21]

Answer:

146.85 g/mol

Explanation:

PV=nRT

n=mass/molar mass

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convert from ml to L= 0.108 L

convert from degree C to K= 456.15 K

convert from mg to g= 0.07796g

then rearrange the formula:

n=PV/RT

=(0.184)(0.108)/(0.08206)(456.15)

n= 5.308*10^(-4)

rearrange the n formula interms of molar mass:

Molar mass= mass/n

=0.07796/(5.308*10^-4)

molar mass= 146.85g/mol

3 0
3 years ago
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zalisa [80]

Answer:

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Explanation:

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Vesna [10]

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Explanation:

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The products will contain the same atoms as there are in the reactants but the bonds will rearrange to form different substances.

Every chemical reaction is accompanied with absorption or release of energy.

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Answer:

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Explanation:

3 0
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