The volume of a balloon filled with \( \mathrm{H}_{2} \) at 275 torr is compressed from 6.40 L to 3.20 L at a constant temperature. What is the final pressure (in atm ) of the the balloon?

\[ \text { Общие химические свойства кислот } \] \( \quad \begin{array}{l}\text { 1. Кислота }+ \text { основание или амфотерный гидроксид } \rightarrow \text { соль }+ \text { вода } \\ \text { 2. Кислота }+ \text { основный или амфотерный оксид } \rightarrow \text { соль }+ \text { вода } \\ \text { 3. Кислота1 }+ \text { соль } 1 \rightarrow \text { кислота } 2+\text { соль } 2, \text { если образуется осадок или } \\ \text { выделяется газ }\end{array} \)

Which of the following should a student select to correctly represent an isotope of \( { }_{19}^{39} \mathrm{~K} \) ?

The volume of a balloon filled with \( \mathrm{H}_{2} \) at 275 torr is compressed from 6.40 L to 3.20 L at a constant temperature. What is the final pressure (in atm ) of the the balloon?

A sample of gas is held at 273.15 K and 1 atm . Remembering that there are 22.4 L gas/mol gas at STP, how many moles of gas do you have if you have 18.2 liters of gas?

A sewage treatment plant discharges a pollutant with a concentration of \( 6 \mathrm{mg} / \mathrm{L} \). The plant's total discharge is 0.5 MGD (millions of gallons per day). Determine the rate of pollutant released in pounds day. Give your answer accurate to at least two decimal places. Hint: 0.5 MGD is 500,000 gallons per day. Use these conversion factors: \( 1 \mathrm{gal}=3.785 \mathrm{~L}, 1000 \mathrm{mg}=1 \mathrm{~g} \), \( \mathrm{g}=1 \mathrm{~kg} \), and \( 1 \mathrm{~kg}=2.2 \) lbs.