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ivanzaharov [21]
3 years ago
11

A hydrobromic acid (HBr) solution has a molar concentration of 0.055 M, Calculate the and pH of the solution. (Remember that Kw=

1.0x10-14M2.)
A) [H3O+]= 5.5x10-2M, [OH-]=1.82x10-13M, pH=1.26
B) [H3O+]= 3.8x10-13, [OH-]=2.6x10-2M, pH=12.42
C) [H3O+]= 4.8x10-3, [OH-]=1.6x10-12M, pH=9.2
D) [H3O+]= 1.0x10-8 [OH-]=1.0x10-6M, pH=8.0
E) cannot be calculated with the information given
Chemistry
1 answer:
seraphim [82]3 years ago
5 0

Answer: Im not sure but i think its B

Explanation: Its hard to explain so im

not gonna do it

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An unknown noble gas has a density of 5.84 g dm-3 at STP. Calculate its molar mass, and so identify the gas.
bagirrra123 [75]

The noble gas is Xenon and its molar mass is 131 g/mol.

<h3>What is the molar mass of the noble gas?</h3>

The molar mass of the noble gas is determined as follows;

Let molar mass of unknown gas be M, and mass of gas be m

Density of the noble gas, ρ = 5.8 g/dm³

density = m/V

At STP;

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From ideal gas equation:

PV = nRT

where n = m/M

PV = mRT/M

M = mRT/PV

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Molar mass of the noble gas = 131 g/mol

The noble gas is Xenon which has molar mass approximately equal to 131 g/mol.

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A chemical reaction occurs when 2 white solids are stirred together they turn into a slushy white solid and the glass jar feels
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Absorbed, endothermic

Explanation:

Based on the heat of reaction, chemical reactions may be classified as endothermic or exothermic.

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