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3 years ago

How many moles are in 6.8 x 1023 molecules of NaOH?

Chemistry

2 answers:

MariettaO [177]3 years ago

5 0

My math may be off but i believe 24 moles

hoa [83]3 years ago

5 0

Answer:

The correct answer is: 1.129 mol

Explanation:

Hello! Let's solve this!

The data we have are:

6.8 x 10 ^ 23 molecules of NaOH

Each one mole of substance there are 6.02x10²³ molecules

number of moles: 6.8 x 10 ^ 23 /6.02x10²³ molecules / mol = 1.129 mol

The correct answer is: 1.129 mol

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3 0

3 years ago

g Five calcite, CaCO3 (MW 100.085 g/mol), samples of equal mass have a total mass of 12.3±0.1 g. What is the absolute uncertaint

diamong [38]

Answer:

The value is $L = 0.985 \pm 0.00801 \ g$

Explanation:

From the question we are told that

The molar mass of $CaCO_3$ is $MW = 100.085 \ g/mol$

The total mass is $m_g = 12.3 \ g$

The uncertainty of the total mass is $\Delta g = 0.1$

Generally the molar weight of calcium is $M_c = 40 g/mol$

The percentage of calcium in calcite is mathematically represented as

$C = \frac{40.07}{100.085} * 100$

$C = 40.03 \%$

Generally the mass of each sample is mathematically represented as

$m= \frac{m_g}{5}$

$m= \frac{12.3}{5}$

$m= 2.46 \ g$

Generally mass of calcium present in a single sample is mathematically represented as

$m_c = 2.46 * \frac{40.04}{100}$

$m_c = 0.985 \ g$

The uncertainty of mass of a single sample is mathematically represented as

$k = \frac{\Delta g }{5}$

$k = \frac{0.1 }{5}$

$k = 0.02\ g$

The uncertainty of mass of calcium in a single sample is mathematically represent

$G = \frac{0.02 * 40.04}{ 100}$

$G = 0.00801 \ g$

Generally the average mass of calcium in each sample is

$L = 0.985 \pm 0.00801$

6 0

3 years ago

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T1 / V1 = T2 / V2

V2 = T2 x V1 / T1

V2 = 308.15 x 7.80 / 698.15

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3 years ago

Classify lead: Select one: C = compound HE = heterogeneous mixture S = homogeneous mixture/solution E = element

Ira Lisetskai [31]

Lead is an E (element) and can be found on the periodic table.

5 0

3 years ago

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puteri [66]

Answer:

4.88 M

Explanation:

M = number moles/Volume (L)

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7 0

2 years ago