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3 years ago

Will give brainliest good points too help asap

Chemistry

1 answer:

nirvana33 [79]3 years ago

6 0

Photovoltaic cell is the correct answer ,it converts sunlight into electricity.Hope this helped!

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How many milliliters of 50 by mass hno3 solution, with a density of 2.00 grams per milliliter are required to make 500 ml

den301095 [7]

Answer:

V = 331.13 mL of 50 by mass NO3 solution

Explanation:

∴ δ sln = 2.00 g/mL

∴ %m HNO3 = 50% = ( mass HNO3 / mass sln ) × 100

∴ V required sln = 500 mL

∴ δ HNO3 = 1.51 g/mL.......from literature

⇒ V sln = mass sln / δ sln = 500 mL

⇒ mass sln = (500 mL )×( 2 g/mL ) = 1000 g sln

⇒ mass HNO3 = ( 0.5 )×(1000 g) = 500 g HNO3

⇒ V HNO3 = ( 500 g HNO3 )×(ml HNO3/1.51 g ) = 331.13 mL

5 0

3 years ago

Calculate the amount of heat needed to melt 148. g of solid octane (C8H18 ) and bring it to a temperature of 117.8 degrees c. Ro

Setler79 [48]

Answer:

The amount of heat is 84.4894kJ

Explanation:

Given data:

mass of octane=148g

The moles of octane is:

$n_{octane} =148g*\frac{1mol}{114.23g} =1.2956moles$

The melting point is=-56.82°C

ΔHfus=20.73kJ/mol

The heat of fusion is:

$Q_{fus} =n_{octane} *delta-H_{fus} =1.2956*20.73=26.8578kJ$

The heat to bring the octane to a temperature of 117.8°C is:

$Q_{2} =mCp(117.8-(56.82))=148*2.23*(117.8+56.82)=57631.5848J=57.6316kJ$

The total heat in the process is:

Qtotal=Qfus+Q₂=26.8578+57.6316=84.4894kJ

4 0

3 years ago

8. A fossil plant that helps support the theory of continental drift is ____.

krek1111 [17]

Answer:

Explanation:

3 0

4 years ago

What does Hydrogen and Nitrogen make when mixed?

vazorg [7]

H + N = NH3

Hydrogen plus nitrogen is ammonia. This is covalent bond.

5 0

4 years ago

Balance the following skeleton reaction and identify the oxidizing and reducing agents: H2S(g) + NO3 ---->’ S8(s) + NO(g) [ac

disa [49]

Answer : Oxidizing agent is $NO^-_3$ and Reducing agent is $H_2S$

Explanation :

The given unbalanced redox reaction is,

$H_2S(g)+NO^-_3(aq)\rightarrow S_8(s)+NO(g)$

In acidic medium, the balanced redox reaction is,

$24H_2S(g)+6NO^-_3(aq)16H^+(aq)\rightarrow 3S_8(s)+16NO(g)32H_2O(l)$

Oxidizing agent : Oxidizing agents are those agent which oxidizes other substance and itself get reduced.

Reducing agent : Reducing agents are those agent which reduces other substance and itself get oxidized.

In this redox reaction, $NO^-_3$ is an oxidizing agent and $H_2S$ is a reducing agent.

The redox reaction is also shown below.

6 0

4 years ago