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8090 [49]
3 years ago
13

Help someone!!!I will mark you brainliest

Chemistry
2 answers:
o-na [289]3 years ago
7 0

Answer:

a) Na2S

b) AlF3

c) O2

d) C6H12O6

Explanation:

please mark me brainliest and 5 star

iVinArrow [24]3 years ago
4 0
A) Na2S
b) AlF3
c) O2
d) C6H12O6
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DIA [1.3K]

Answer:

1. 4.75

2. 5.50

Explanation:

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3 years ago
A student says that all pure substances are elements. Do you agree? Why or why not? Question 14 options:I disagree.  Elements fo
LenaWriter [7]

Answer: I disagree.  Elements form all pure substances, but some pure substances include elements bonded together to form molecules and compounds.


Explanation:


Pure substances are those that have a uniform and constant (invariable) composition.


That condition is met by both elements and compounds.


Elements are pure substances of one only kind of atoms. For example, gold, oxygen, sodium, hydrogen, are pure substances that arer elements. There are 118 elements known and they are all listed in the periodic table.


Compounds are pure substances formed by two or more different kind of atoms. Water (H₂O), table salt (NaCl), and ethanol (CH₃-CH₂OH), are examples of pure substances that are compounds. There are pratically infinite different compounds.


In conclusion, compounds are also pure substances, since every sample of a given compound has always the same kind of elements bonded in the same way.


4 0
3 years ago
Read 2 more answers
Choose the most correct statement about metals
stellarik [79]

Answer:

C Metals are ductile, meaning they can be pulled into wires.

7 0
3 years ago
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Suppose 110.0 mL110.0 mL of hydrogen gas at STP combines with a stoichiometric amount of fluorine gas and the resulting hydrogen
Fittoniya [83]

Suppose 110.0 mL of hydrogen gas at STP combines with a stoichiometric amount of fluorine gas and the resulting hydrogen fluoride dissolves in water to form 150.0 mL of an aqueous solution. 0.032 M is the concentration of the resulting hydrofluoric acid.

<h3>What is Balanced Chemical Equation ?</h3>

The balanced chemical equation is the equation in which the number of atoms on the reactant side is equal to the number of atoms on the product side in an equation.

Now write the balanced chemical equation

H₂ + F₂ → 2HF

<h3>What is Ideal Gas ?</h3>

An ideal gas is a gas that obey gas laws at all temperature and pressure conditions. It have velocity and mass but do not have volume. Ideal gas is also called perfect gas. Ideal gas is a hypothetical gas.

It is expressed as:

PV = nRT

where,

P = Pressure

V = Volume

n = number of moles

R = Ideal gas constant

T = temperature

Here,

P = 1 atm   [At STP]

V = 110 ml = 0.11 L

T = 273 K   [At STP]

R = 0.0821   [Ideal gas constant]

Now put the values in above expression

PV = nRT

1 atm × 0.11 L = n × 0.0821 L.atm/ K. mol × 273 K

n = \frac{1\ \text{atm} \times 0.11\ L}{0.0821\ \text{L. atm/ K. mol} \times 273\ K}

n = 0.0049 mol

<h3>How to find the concentration of resulting solution ? </h3>

To calculate the concentration of resulting solution use the expression

C = \frac{n}{V}

   = \frac{0.0049}{0.15}  

   = 0.032 M

Thus from the above conclusion we can say that Suppose 110.0 mL of hydrogen gas at STP combines with a stoichiometric amount of fluorine gas and the resulting hydrogen fluoride dissolves in water to form 150.0 mL of an aqueous solution. 0.032 M is the concentration of the resulting hydrofluoric acid.

Learn more about the Ideal Gas here: brainly.com/question/25290815
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2 years ago
How many molecules of ethane ( C2H6) are present in 0.197g of C2H6?
gayaneshka [121]

1

C2H6/C2H6=1

dasdwasdwasdwasdasdwa

8 0
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