Standard pressure is 101.3 kpa, which is equal to 760.o mmhg. if gas has a pressure of 545 mmhg, what is its pressure in kpa to the proper number of significant figures?

72.6 kPa

Explanation:

We can use ratios to answer this question

760 mmHg : 101.3 kPa

545 mmHg : x

then we cross multiply keeping note of the unit

760x mmHg = 55 208.5 mmHg.kPa

x = 72.6 kPa

*It is worth noting that the k that represents kilo in kPa must be a small letter all the time

in 1783 cavendish was working with his hydrogen gas and found that when he burned it and condensed the vapor it was water. this was very significant since it disproved the greek theory of elements completely since water was not a simple substance but the product of two gases. it was lavoisier who hearing of the experiment gave cavendish's gas the name hydrogen ("water-producer") and added that hydrogen burned by combining with oxygen and that water was a hydrogen-oxygen combination.

explanation: