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Ugo [173]
2 years ago
8

A balloon is filled with 3.8 l of helium gas at stp. approximately how many moles of helium are contained in the balloon?

Chemistry
2 answers:
love history [14]2 years ago
7 0
Hope this helps you.

Lelechka [254]2 years ago
3 0

Answer:

0.16964 moles ≈ 0.17 moles

Explanation:

At STP, one mole of a gas has a volume of 22.4 L.

1 mole = 22.4L

x mole = 3.8L

x =  ( 3.8 * 1 ) / 22.4

x = 3.8 / 22.4

x = 0.16964 moles ≈ 0.17 moles

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If you were going to build a system to check the effectiveness of automobile catalytic converters on cars, what substances would
statuscvo [17]

Answer:

Oxides of nitrogen and hydrocarbon

Explanation:

An automobile catalytic converter is a substance that catalyses redox reactions that convert toxic gases emanating from an automobile engine to less toxic gases.

The substance work by converting carbon monoxide (CO) and hydrocarbons to carbon dioxide and water and oxides of nitrogen to nitrogen and oxygen gas respectively.

<em>Hence, in order to check the effectiveness of a catalytic converter, unburned hydrocarbon and oxides of nitrogen are substances to watch out for in the car exhaust. None of these gases should be found in an exhaust with effective catalytic converter and vice versa. </em>

8 0
3 years ago
Do all mutations affect the STRUCTURE of proteins ? Do all mutations affect the FUNCTIONS of proteins??
finlep [7]

Answer:

1. No; only a small percentage of mutations cause genetic disorders—most have no impact on health or development.

2. No. For example, some mutations alter a gene's DNA sequence but do not change the function of the protein made by the gene.

Explanation:

7 0
3 years ago
When doing a recrystallization what observations would prompt
Volgvan
<h2>Observation of purified crystals.</h2>

Explanation:

  • Recrystallization is the process in which a compound is dissolved in a hot solvent and then allowed to cool which forms the crystals.
  • It is a technique used for purification of solids.
  • Recrystallization mainly depends on the solubility of the solvent that means the solid should be soluble in the solvent when it is hot and should be insoluble in the same solvent when it is cool.
  • The observations while doing recrystallization is to observe the purified crystals obtained and to filter it out.

5 0
2 years ago
At the normal melting point of NaCl, 801 degrees C, its enthalpy of fusion is 28.8 kJ / mol. The density of the solid is 2.165 g
melisa1 [442]

<u>Answer:</u> The increase in pressure is 0.003 atm

<u>Explanation:</u>

To calculate the final pressure, we use the Clausius-Clayperon equation, which is:

\ln(\frac{P_2}{P_1})=\frac{\Delta H}{R}[\frac{1}{T_1}-\frac{1}{T_2}]

where,

P_1 = initial pressure which is the pressure at normal boiling point = 1 atm

P_2 = final pressure = ?

\Delta H = Enthalpy change of the reaction = 28.8 kJ/mol = 28800 J/mol     (Conversion factor: 1 kJ = 1000 J)

R = Gas constant = 8.314 J/mol K

T_1 = initial temperature = 801^oC=[801+273]K=1074K

T_2 = final temperature = (801+1.00)^oC=802.00=[802+273]K=1075K

Putting values in above equation, we get:

\ln(\frac{P_2}{1})=\frac{28800J/mol}{8.314J/mol.K}[\frac{1}{1074}-\frac{1}{1075}]\\\\\ln P_2=3\times 10^{-3}atm\\\\P_2=e^{3\times 10^{-3}}=1.003atm

Change in pressure = P_2-P_1=1.003-1.00=0.003atm

Hence, the increase in pressure is 0.003 atm

6 0
3 years ago
mass of 6.584 g. After it is heated, it has a mass of 4.194 g. What is the percentage by mass of water in the hydrate?
Bad White [126]
M₁=6.584 g
m₂=4,194 g

m(H₂O)=m₁-m₂

w(H₂O)=m(H₂O)/m₁

w(H₂O)=(m₁-m₂)/m₁

w(H₂O)=(6.584-4.194)/6.584=0.3630  (36.30%)

the percentage by mass of water in the hydrate 36.30

8 0
2 years ago
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