A gas mixture called heliox, 6.11% o2 and 93.89% he by mass, is used in scuba tanks for descents more than 65 m below the surface. calculate the mole fractions of he and o2 in this mixture. he is 0.9980

How are meiosis related to sexual reproduction

A beach towel is laying on the sand in the sun. Why does the sand feel hotter to touch than the towel? O A. The sand is at a higher temperature. O O B. The sand has a temperature far above absolute zero. O C.

Whenever an acid and base combined what are two substance are formed

Enzymes that work in the stomach would prefer a pH that is

What is the chemical name for sugar

Is it possible for a balloon with an initial internal pressure equal to 250.0 kPa to naturally expand to four times its initial volume when the temperature remains constant and the atmospheric pressure is 101.3 kPa?

How many atoms of gold (Au) are present in a sample of 2.5 mol Au? A. 1.5 * 1024 atoms Au B. 1.5 * 1023 atoms Au C. 4.2 * 1024 atoms Au D. 4.2 * 1023 atoms Au

what might cause the goldfish population to drop if the temperature moves out of its normal range? Name three things

Why must a chemistry experiments performed in a well ventilated room?

What kind of chemical bond does salt have?