During a chemical reaction, the sum of the masses of the reactants and

During a chemical reaction, the sum of the masses of the reactants and products remains unchanged. Ina pure chemical compound, elements are always present in a definite proportion by mass. These two statements represent two very important laws in chemistry.i) What are these two laws collectively called?ii) In a reaction, 5.3g of sodium carbonate reacted with 6g of ethanoic acid. The products formed include 2.2g of carbon dioxide, 0.9g of water and ‘X’ gram of sodium ethanoate. What is the value of ‘X’?iii) If hydrogen and oxygen combine in the ratio 1:8 by mass to form water, what mass of oxygen gas would be required to react completely with 3g of hydrogen?iv) The building block of matter is used to create a unit for measuring masses of atoms. Define one atomic mass unit.

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QUESTION - 3/35 2020033800027601 :

If the standard DEVIATION of a Poisson variable X is √2, then the probability that X is STRICTLY positive is ________.

e^2

e^-2

1 - e^2

1 - e^-2

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