helium gas, 3.0 x 10-4 g dissolved in water, express this concentration in parts per million.

Answer 1

To express the concentration in parts per million (ppm), we need to find the ratio of the mass of helium gas to the total mass, and then multiply by 1,000,000.

Let's assume we have 1 L of water. The mass of water can be calculated as follows:

1 L of water = 1000 g (since 1 L of water weighs approximately 1000 g)

Now, we can find the ratio of the mass of helium gas to the total mass:

(3.0 x 10-4 g) / (1000 g) = 3.0 x 10-7

Finally, multiply the ratio by 1,000,000 to get the concentration in ppm:

(3.0 x 10-7) * 1,000,000 = 0.3 ppm

So, the concentration of helium gas dissolved in water is 0.3 ppm.