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3 years ago

Help me ples HELP HELP HELP HELP HELP

Chemistry

1 answer:

Darya [45]3 years ago

3 0

Answer:

Explanation:autotroph and photosynthesis

sorry if I am wrong I am dumb. :( :(

I found it on google.

God bless, stay safe, and good luck! :) :)

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You want to make 100 mL of a 2.5 M stock solution of calcium chloride (molecular weight 110.98 g/mol). How many grams of calcium

Evgesh-ka [11]

Answer:

27.7 g

Explanation:

100 mL = 0.100 L

To solve this problem we use the definition of molarity:

M = mol / L

From the problem we're given M = 2.5 M and volume = 0.100 L. We use the above formula and calculate the required moles of calcium chloride (CaCl₂):

2.5 M = moles / 0.100 L

moles = 0.25 moles CaCl₂

Finally we use the molecular weight of calcium chloride to calculate the required mass:

0.25 moles CaCl₂ * 110.98 g/mol = 27.745 g CaCl₂

Rounding to the nearest tenth of a gram the answer is 27.7 g.

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3 years ago

#1/ 81.8 grams carbon 18.2 grams hydrogen molar mass 132.0g/mol.

dlinn [17]

Answer:

#2 Empirical formula _Na3S4O9____

Molecular formula ___Na6S8O18__

Explanation:

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3 years ago

What is the number of electrons shared in the multiple carbon-carbon bond in one molecule of 1-pentyne?

jeka57 [31]

Where the options are?

8 0

3 years ago

Many hospitals, and some doctors\' offices, use radioisotopes for diagnosis and treatment, or in palliative care (relief of symp

jekas [21]

Answer:

For a: The isotopic symbol of the above atom will be $_{53}^{131}\textrm{I}$

For b: The isotopic symbol of the above atom will be $_{77}^{192}\textrm{Ir}$

For c: the isotopic symbol of the above atom will be $_{62}^{153}\textrm{Sm}$

Explanation:

The isotopic representation of an atom is: $_Z^A\textrm{X}$

where,

Z = Atomic number of the atom

A = Mass number of the atom

X = Symbol of the atom

For a: Iodine-131

Atomic number of iodine = 53

Mass number of iodine = 131

Symbol of iodine = I

The isotopic symbol of the above atom will be $_{53}^{131}\textrm{I}$

For b: Iridium-192

Atomic number of iridium = 77

Mass number of iridium = 192

Symbol of iridium = Ir

The isotopic symbol of the above atom will be $_{77}^{192}\textrm{Ir}$

For c: Samarium-153

Atomic number of samarium = 62

Mass number of samarium = 153

Symbol of samarium = Sm

The isotopic symbol of the above atom will be $_{62}^{153}\textrm{Sm}$

7 0

3 years ago

Is powder considered a liquid or a Solid?

Llana [10]

Answer:

Solid

Explanation:

Is this a trick question?

If not, solid.

7 0

2 years ago

Read 2 more answers