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2 years ago

Determine the empirical formula of a compound that contains 49.4% k, 20.3% s and 30.3% o.

Chemistry

1 answer:

Marina CMI [18]2 years ago

8 0

K2SO3 will be the answer.

Good luck :)

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An iron atom has a mass of ×9.2710−23g and a cooking pot has a mass of 0.500kg

morpeh [17]

The number of iron atoms in a cooking pot that has a mass of 0.500 kg can be solve by dividing it by the mass of the iron atom.

Number of iron atoms = ( 0.5 kg) (1000g / 1kg) ( 1 iron atom / 9.27 x 10^-23 g)

Number of iron atoms = 5.39 x 10 ^24 iron atoms

6 0

2 years ago

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65g of nitric acid are produced in a reaction. 2.5g of platinum are added to the reaction vessel at the start of the reaction to

AysviL [449]

Answer:

2.5 g of platinum

Explanation:

Recall that a catalyst is a specie added to a reaction system to increase the rate of reaction. A catalyst does not participate in the chemical reaction hence it remains unchanged at the end of the chemical reaction. A catalyst merely provides an alternative reaction pathway by lowering the activation energy of the reaction system. Hence a catalysed reaction usually proceeds faster with less energy requirement than the uncatalysed reaction.

Since the catalyst does not participate in the reactions and remains unchanged at the end of the reaction, the mass of platinum will remain the same (2.5g). The mass can only change if a specie participates in the chemical reaction. Hence the answer.

6 0

2 years ago

How many moles are there in 3.612 X 10^24 molecules of phosgene (COCL2)

Ugo [173]

Answer:

Explanation:

No of molecules = 3.612*10(24)

Avogadro's number = 6.022*10(23)

no of moles = No of molecules/Avogadro's number

No of moles =3.612*10(24)/6.022*10(23)

No of moles = 6mol

3 0

2 years ago

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What mass of powdered drink mix is needed to make a 0.5 M solution of 100 mL?

Maru [420]

Answer:

There is 17,114825 g of powdered drink mix needed

Explanation:

Step 1 : Calculate moles

As given, the concentration of the drink is 0.5 M, this means 0.5 mol / L

Since the volume is 100mL, we have to convert the concentration,

⇒0.5 / 1 = x /0.1 ⇒ 0.5* 0.1 = x = 0.05 M

This means there is 0.05 mol per 100mL

Step 2 : calculate mass of the powdered drink

here we use the formula n (mole) = m(mass) / M (Molar mass)

⇒ since powdered drink mix is usually made of sucrose (C12H22O11) and has a molar mass of 342.2965 g/mol.

0.05 mol = mass / 342.2965 g/mol

To find the mass, we isolate it ⇒0.05 mol * 342.2965 g/mol = 17,114825g

There is 17,114825 g of powdered drink mix needed

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2 years ago

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Which choice below correctly completes the sentence? _______ reaches the Earth's surface through _______, then turns into ______

blondinia [14]

Answer:

d , before the molten rock becomes lava, it is first magma, and most people know that lava is ejected from volcanoes

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2 years ago