CHEMISTRY COLLEGE

What isotope has a mass number of 18 and an atomic number of 7​

Answers

Answer 1
Answer:

Answer:

nitrogen 18

nitrogen has an atomic number of 7

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What is the mass of oxygen in 250 go of sulfiric acid, H2CO4

Answers

Hope this helps you.

Your answer is 160 grams I hope this helps

Movement of earths tectonic plates appears to be caused by

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Answer: The force that causes most of the plate movement is thermal convection, where heat from the Earth's interior causes currents of hot rising magma and cooler sinking magma to flow, moving the plates of the crust along with them. ... In ridge push and slab pull, gravity is acting on the plate to cause the movement

As we drive an automobile, we dont't think about the chemical consumed and produced. Prepare a list of the principal chemicals consumed and produced during the operation of an automobile.

Answers

Answer:

Explanation:

In an internal combustion engine operational in automobiles, fuels are converted into mechanical energy in order to move pistons.

The basic reaction in automobile engines is combustion.

     Principal chemicals consumed                 Chemicals produced

                   Petroleum                                           Carbon dioxide

                                                                               Carbon monoxide

                                                                               Nitrogen oxides

                                                                               Sulfur oxides

  In diesel engines, production of particulate carbon is also produced.

Automobiles such as car, truck, motorbikes run on petrol or diesel. While operating these automobiles, combustion of diesel or petrol takes place which in turn requires oxygen for the process to occur.

Operation of the automobiles consumes oxygen, petrol or diesel and releases harmful chemicals like carbon dioxide (CO2), sulphur dioxide (SO2), carbon monoxide (CO) and many more. These chemicals pollutes the air and also affects the survival of living organisms by affecting the respiratory organs.  

Given that e = 9.0 v , r = 98 ω and c = 23 μf , how much charge is on the capacitor at time t = 4.0 ms

Answers

Let charge across the capacitor be Q, current through the circuit be I.
Voltage difference across the resistor = rI
Voltage difference across the capacitor = Q/c
Loop rule: net voltage change through a loop must be zero, so
9 = rI + Q/c. Since I = dQ/dt,
r dQ/dt + Q/c = 9
Solving, Q = 9c (1 - e^(t/rc)). Plug in the numbers from the problem for the numerical answer.

A food is initially at a moisture content of 90% dry basis. Calculate the moisture content in wet basis

Answers

Answer:

Moisture content in wet basis = 47.4 %    

Explanation:

Moisture content expresses the amount of water present in a moist sample.Dry basis and wet basis are widely used to express moisture content.  

The next equation express the moisture content in wet basis:  

                MC_(wb)=(MC_(db))/(1+MC_(db))

where,  MC_(wb): moisture content in wet basis and  

             MC_(db): moisture content in dry basis    

We now calculate the moisture content in wet basis:

MC_(wb)=(MC_(db))/(1+MC_(db))

MC_(wb)=(0.90)/(1+0.90)

MC_(wb)= 0.474 = 47.4 % wet basis    

Have a nice day!

How many moles of h2 are need to produce 11.21 g of nh3

Answers

first of all, you should write down a balanced equation for the reaction
3H2 + N2 ----> 2NH3
convert  from grams of NH3 ----- moles NH3------moles H2------g H2

11.21 gNH3 / ( 17g/ mol NH3)* (3 moles of H2/ 2 moles of NH3) * (2 g H2/ mol H2) 
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