Okay, so based on Newton’s gravity laws, (An object at rest stays at rest and an object in motion stays in motion.)
It looks like your answer is D/B
The pressure of the machine has to be reduced to 0.4 atm in order for the breathing machine to bring 500 ml of air into the lungs.
<h3>What is the relationship between volume and pressure?</h3>
Volume and pressure are inversely relate as given by the Boyle's law equation below:
The complete question is as follows:
<em>You Want To Design A Breathing Machine That Will Bring 500 ML Of Air Into The Lungs. You Begin With 100 ML Of Air At 2 atm Of Pressure. How Would You Change The Pressure In Your Machine To Accomplish Your Goal?</em>
From the question, 
The change in pressure,
will be:

Therefore, the pressure of the machine has to be reduced to 0.4 atm in order for the breathing machine to bring 500 ml of air into the lungs.
Learn more about pressure and volume at: brainly.com/question/469270
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Answer:
Similar propoties is the answer
I will solve the question assuming the reaction used as below
1 CH4(g) + 1 H2O(g) ==> 1 CO(g) + 3 H<span>2(g)
In the reaction, CH4 is the reactant and CO is the wanted product. If you look at the coefficient of the substance, for every 1 mol of CH4 react there will be 1 mol of CO produced. So, if you have 7 moles of CH4 the amount of CO produced would be: 7 moles * 1/1= 7 moles of CO</span>
The amount of CaCo3 remaining is 11.5g