A 256 mL sample of HCl gas is in a flask where it exerts a force (pressure) of 67.5 mmHg. What is the pressure of the gas if it were transferred to a 135 mL flask

The pressure in the new flask would be if the here acts like an ideal gas.  

Explanation:

Assume that the sample here acts like an ideal gas. By Boyle's Law, the pressure of the gas should be inversely proportional to its volume .

For example, let the initial volume and pressure of the sample be and . The new volume and pressure of this sample shall satisfy the equation: .

In this question,

The goal is to find the new pressure of this gas, .

Assume that this sample is indeed an ideal gas. Then the equation should still hold. Rearrange the equation to separate the unknown, . Note: make sure that the units for and are the same before evaluating. That way, the unit of

.

linda: 3 ; laura: 15

step-by-step explanation:

note that linda + laura's age is 18, and that linda is 12 years younger than her sister.

let "linda" = x , "laura" = y:

x + y = 18

x = y - 12

first, plug in y - 12 for x in the first equation:

(y - 12) + y = 18

simplify.

2y - 12 = 18

isolate the variable (y). note the equal sign, what you do to one side, you do to the other. do the opposite of pemdas. first add, then divide.

2y - 12 (+12) = 18 (+12)

2y = 18 + 12

2y = 30

(2y)/2 = (30)/2

y = 30/2

y = 15

next, plug in 15 for y in the second equation (the other equation would work too).

x = y - 12

x = (15) - 12

x = 3

linda's age is 3, laura's age is 15.

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