CHEMISTRY MIDDLE SCHOOL

What is the mass of 4.38 x 10^24 formula units of sodium chloride (NaCl)?

Answers

Answer 1

Answer:

Answer:

Mass = 427.05 g

Explanation:

Given data:

Formula units of sodium chloride = 4.38 ×10²⁴

Mass of NaCl = ?

Solution:

One mole contain formula units = 6.022 ×10²³

4.38×10²⁴ formula units × 1mol /6.022 ×10²³ formula units

0.73 ×10¹ mol

7.3 mol

Mass of NaCl:

Mass = number of moles × molar mass

Mass = 7.3 mol × 58.5 g/mol

Mass = 427.05 g

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If 10.0 L of oxygen gas at STP are heated to 512 Celsius what will be the new volume of the gas if the pressure is also increased to 1.75 ATM?

Answers

Answer:

16.4 L

Explanation:

we can use the combined gas law equation that gives the relationship among volume, temperature and pressure conditions of gases.

P1V1/T1 = P2V2/T2

STP conditions are standard temperature and pressure conditions

P1 is standard pressure = 1 atm , T1 is standard temperature = 273 K

and V1 is the volume

P2 is pressure, T2 is temperature and V2 is volume at the second instance

temperature is in kelvin scale,

512 ° + 273 = 785 K

substituting the values in the equation

1 atm x 10.0 L / 273 K = 1.75 atm x V / 785 K

V = 16.4 L

new volume is 16.4 L

Which condensed structural formula represents an unsaturated compound?(1) CH3CHCHCH3 (3) CH3CH3
(2) CH3CH2CH3 (4) CH4

Answers

(1) CH3CHCHCH3.................

(1) CH3CHCHCH3 because it contains a double bond.

Which elements are metalloids? Check all that apply.boron
tungsten
aluminum
bismuth
silicon
tellurium

Answers

Answer:

Boron
Silicon
Tellurium

Explanation:

Elements in the periodic table are either metals, non-metals or metalloids.
Metals are elements that react by losing electron(s) to attain an octet configuration. They occupy groups I, II and III of the periodic table and the transition metals.
Non-metals, on the other hand, are elements that react by gaining electron(s) to attain a stable configuration. Examples include halogens and noble gases among others.
Metalloids are elements in the periodic table that have the properties of both metals and non-metals.
Other examples of metalloids are arsenic, tellurium, germanium and polonium.

Answer:

Boron

Silicon

Tellurium

Explanation:

edgenuity

How do u separate salt from rock salt?

Answers

In order to separate salt from rock salt, first crush the salt rock into small pieces, put it in a container and add water. Stir until it dissolves. Pour the solution to a funnel lined with coffee filter. Heat the filtered water and the water will evaporate leaving salt behind.

Aqueous solutions of chromium(III) iodide and potassium hydroxide react to give a chromium(III) hydroxide precipitate and aqueous potassium iodide.Express your answer as a chemical equation. Identify all of the phases in your answer. Enter noreaction if there is no reaction.

Answers

CrI₃ (aq) + 3 KOH (aq) → Cr(OH)₃ (s) + 3 KI (aq)

Explanation:

The chemical reaction between chromium (III) iodide (CrI₃) and potassium hydroxide (KOH):

CrI₃ (aq) + 3 KOH (aq) → Cr(OH)₃ (s) + 3 KI (aq)

where:

(aq) - aqueous

(s) - solid

The reaction will produce solid chromium(III) hydroxide (Cr(OH)₃) and KI aqueous potassium (KI).

Learn more about:

problems with chromium(III) salts

brainly.com/question/9821533

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A 475mL sample of gas was collected at a temperature of -21.5 and a pressure of 756mmHg. Calculate the volume of a gas(in liters) if the conditions were altered to STP