QUESTION 15 A mixture of 1.50 g CO 2(g) , 1.25 g H 2(g) and 1.45g O 2(g) has a t

Question

QUESTION 15

A mixture of 1.50 g CO2(g), 1.25 g H2(g) and 1.45g O2(g) has a total pressure of 2.50 atm. Calculate the partial pressure of O2(g)?

1.02 atm

0.162 atm

0.0233atm

1.00 atm

0.234 atm

0.7143 points   

QUESTION 16

Which of the following classifications best describes element number 85, astatine?

alkali metal

metalloid

metal

nonmetal

noble gas

0.7143 points   

QUESTION 17

Which of the following (with specific heat capacity provided) would show the smallest temperature change upon gaining 150.0 J of heat?

50.0 g Al, CAl = 0.903 J/g.

1.02 atm

0.162 atm

0.0233atm

1.00 atm

0.234 atm

Explanation / Answer

1. no of moles of c02 = 1.5/44 = 0.034

no of moles of h2 = 1.25/2 = 0.625

no of moles of o2 = 1.45/32 = 0.0453

partial pressure of o2 will be = 0.0453/0.034+0.625+0.0453 * 2.5 = 0.162 atm

2. metalloid

3. 50.0 g Al, CAl = 0.903 J/g.

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