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Rasek [7]
3 years ago
5

A helium balloon has a volume of 2.5 L. When heated to 343.5K the pressure of the gas is 66.7 kPa. How many moles of He gas woul

d there be?
Chemistry
1 answer:
Lelu [443]3 years ago
8 0

Answer:

0.06mole

Explanation:

Given parameters:

Volume of balloon = 2.5L

T = 343.5K

P  = 66.7kPa; in atm  gives  = 0.66atm

Unknown:

Number of moles of He  = ?

Solution:

To solve this problem, we use the ideal gas equation.

 It is mathematically expressed as;

               Pv = nRT

  where  p is the pressure

              v is the volume

               n is the number of moles

               R is the gas constant

               T is the temperature

      0.66 x 2.5  = n x 0.082 x 343.5

                      n  = 0.06mole

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Vitamin c is known chemically by the name ascorbic acid determine the empirical formula of ascorbic acid if it is composed of 40
kow [346]

Answer:

=C_3H_4O_3

Explanation:

When percentage composition is given, and asked for the empirical formula, it is simplest to  assume 100 g of material. Thus,

Mass C = 40.92 g.  Moles C = 40.92 g x 1 mole/12 g = 3.41 moles C

Mass H = 4.58 g.  Moles H = 4.58 g x 1 mole/1.0 g = 4.58 moles H

Mass O = 54.50 g.  Moles O = 54.50 g x 1 mole/16 g = 3.41 moles O

Now, we want to get the moles into whole numbers, so we begin by dividing all by the smallest, i.e. divide all values by 3.41.

Moles C = 3.41/3.41 = 1

Moles H = 4.58/3.41 = 1.34

Moles O = 3.41/3.41 = 1

Now, in order to get 1.34 to be a whole number we multiply it (and all others) by 3

Moles C = 1x3 = 3

Moles H = 1.34x3 = 4

Moles O = 1x3 = 3

Empirical Formula =C_3H_4O_3

3 0
3 years ago
Which is NOT part of the definition of matter
qaws [65]

Answer:

Everything that has mass and takes up space is matter. Every day, you find something usual that either does't have mass or else don't take up space. Those things are non-matter. Basically, any type of energy or any abstract concept is an example of something that does not have matter.

Explanation:

7 0
3 years ago
Read 2 more answers
Which is the balanced equation for S8 + O2 → SO2?
topjm [15]

Answer: S8 + O2 → S8O2: not 100% sure

Explanation:

A balanced chemical equation happens when the quantity of the particles is required on the reactants side is equivalent to the quantity is the molecules in the items side.

7 0
2 years ago
Someone plss help me!!!
NikAS [45]

Answer:

d. Cl2

sorry if I'm wrong

Cl2, as shown in the picture should have electrons in both the atoms but, in the question, the electrons are only in one of the atoms.

hope it helps :)

4 0
3 years ago
4 Infer is the reaction below possible?
mars1129 [50]
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