1.) A balloon contains 0.126 mol of gas and has a volume of 2.74 L .

If an additional 0.124 mol of gas is added to the balloon (at the same temperature and pressure), what will its final volume be?
Express your answer in liters to three significant figures.

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2.) A cylinder with a moveable piston contains 0.547 mol of gas and has a volume of 295 mL .

What will its volume be if an additional 0.342 mol of gas is added to the cylinder? (Assume constant temperature and pressure.)

Problem 1: 5.44LProblem 2: 479mL

Explanation:

Problem 1.

a) Data:

n₁ = 0.126 molV₁ = 2.74 Ln₂ = 0.126mol + 0.124molV₂ = ?Conditions: constant temperature and pressure

b) Physical principles:

The volume occupied by a gas, when the temperature and pressure remain unchanged, is proportional to the number of moles of gas.

         

c) Solution:

Solve for V₂ , substitute and compute:

       

Problem 2.

a) Data:

n₁ = 0.547molV₁ = 295 mLV₂ = ?n₂ = 0.547mol + 0.342 molConditions: constant temperature and pressure

b) Physical principles:

The same as above: the volume occupied by a gas, when the temperature and pressure remain unchanged, is proportional to the number of moles of gas.

         

c) Solution:

Solve for V₂ , substitute and compute:

       

Chewy,wrapped,not in all white,the wrapper is clear

the catch is that the top numbers are atomic masses the bottom numbers are the numbers of protons and electrons in an uncharged atom. they are the number of that atoms as you would find them on the periodic table. further, the numbers on the left are used to determine the missing numbers on the right

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer