All categories

3 years ago

SCIENCE

Chemistry

2 answers:

erik [133]3 years ago

8 0

C. their radiation facilitates nuclear fusion in young stars

ICE Princess25 [194]3 years ago

7 0

Their radiation facilitates nuclear fusion in young stars.

You might be interested in

Calcium carbide reacts with water to produce acetylene gas according to the following equation: CaC2(s) + 2H2O(l)C2H2(g) + Ca(OH

mars1129 [50]

Answer : The number of moles of $CaC_2$ reacted was, 0.214 moles.

Explanation :

First we have to calculate the mole of $C_2H_2$ gas.

Using ideal gas equation:

$PV=nRT$

where,

P = Pressure of $C_2H_2$ gas = 748 mmHg - 23.8 mHg = 724.2 mmHg = 0.953 atm (1 atm = 760 mmHg)

V = Volume of $C_2H_2$ gas = 5.50 L

n = number of moles $C_2H_2$ = ?

R = Gas constant = $0.0821L.atm/mol.K$

T = Temperature of $C_2H_2$ gas = $25^oC=273+25=298K$

Putting values in above equation, we get:

$0.953atm\times 5.50L=n\times (0.0821L.atm/mol.K)\times 298K$

$n=0.214mol$

Now we have to calculate the moles of $CaC_2$

The balanced chemical reaction is:

$CaC_2(s)+2H_2O(l)\rightarrow C_2H_2(g)+Ca(OH)_2(aq)$

From the balanced chemical reaction we conclude that,

As, 1 mole of $C_2H_2$ gas produced from 1 mole of $CaC_2$

So, 0.214 mole of $C_2H_2$ gas produced from 0.214 mole of $CaC_2$

Therefore, the number of moles of $CaC_2$ reacted was, 0.214 moles.

4 0

3 years ago

Explain how you would find the number of moles of carbon in 4.5 kg of carbon.

UkoKoshka [18]

In a simplified version, check the number carbon atoms present and multiply by its relative atomic mass. Later divide by the given mass (4.5 x 1000 = 4500g) and you’ll get the number of mole of carbon

3 0

3 years ago

2. what<br>energy<br>transformation

Masteriza [31]

Answer:

when energy changes from one form to another like in a hydroelectric dam that transform the kinetic energy.

Explanation:

3 0

4 years ago

Plz help and plz tell me if u need any thing else

andrew-mc [135]

Pick "A" as the answer.

4 0

4 years ago

A student performs a titration procedure by adding NaOH to a solution that contains H+ ions. She added the indicator, phenolphth

Jobisdone [24]

Indicators are substances that produce colour changes to indicate the presence or absence of a threshold concentration of a particular chemical specie. In neutralization reaction, indicators produce colour changes on the basis of the pH of the solution. In acid base titration, indicators are used to indicate the end point of the neutralization reaction. The end point of acid base titration is the equivalence point when the moles of the of the standard solution is equal to the moles of the unknown solution. Thus, the correct option is B. Note that the solution that contain the H+ ions is the acid.

7 0

3 years ago

*SCIENCE*

SCIENCE