Atightly sealed 5.0-l flask contains 781 mm hg of ar at 19 °c. the flask is heated until the pressure is doubled. what is the temperature of the gas?

The temperature of the gas is 311°C

Using Kay-Lussac's law of gases:

where P1 = 781 mmHg

P2 = 1562 mmHg

T1 = 19°C = 292 K

T2 = ?

making T2 subject of formula of gas laws

T2 = T1 × P2 / P1

T2 = 292 × 1562/781

T2 = 584 K or 311° C

Therefore, the temperature of the gas is 311°C

Learn more about about temperature and pressure of gases at: link

- calcium has greater affinity to bond with electron receptors than hydrogen does and hence, it has the ability to replace hydrogen in most of its compounds.

- lithium has 2 valence electrons in the product because it can make only 1 bond with hydrogen. beryllium has 4 valence electrons in the product because it can only make 2 bonds. it has fewer electrons than neon and can react with electron donors. each hydrogen has 2 valence electrons, the same as helium.

- the covalent bond formed between carbon and hydrogen is polar because carbon is more electronegative than hydrogen and it attracts the bonded electron pair closer to itself, thus giving hydrogen a partial positive charge.

- a hydrogen bond is a relatively weak bond that hydrogen atoms make with the electronegative atoms nitrogen, oxygen or fluorine.

so the best choice is a.) 2 calcium (ca) atoms