Lauren asked in Science & MathematicsChemistry · 3 weeks ago

Use the following units:

atm

mmHg

kPa

K

C

Answers should be to 3 significant figures.

If a specific compound is mentioned in the problem, include the chemical formula in the answer. If the problem states a generic gas, do not include the word gas in the final answer.

1.How many mmHg are in 1.74 atm?

2.How many kelvin are in 68.5 degrees C?

Relevance
• Dr W
Lv 7
3 weeks ago

(1.74 atm) * (760mmHg / 1atm) = 1.32x10^3 mmHg

(68.5°C + 273.15K) = 341.6 K

the first answer is limited to 3 sig figs

the second answer is limited in precision to the 0.1's column

if you're wondering about the sig figs

.. (1) for multiplication / division, the answer is limited to the same number

.. .. ..of sig figs as the factor with the least number of sig figs

.. . .. . 1.74 has 3 sig figs

.. . .. . 760 and 1 are exact with infinite sig figs

.. . .. ..so the answer is limited to 3 sig figs

.. (2) for addition and subtraction, the final answer is limited to the

.. . .. precision of the least precise addend.

.. . . . .68.5 is precise to the 0.1's column

.. . .. ..273.15 is precise to the 0.01's column

.. . .. ..so the result is limited to the lower precision.. 0.1's column

• 3 weeks ago

The second is correct.

The first one is correct, but it has 4 significant figures and not 3. The best way to express that answer with 3 significant figures is to write it in scientific notation: 1.32X10^3 mm Hg