The flask was placed in a water bath for the entire duration of the experiment. The purpose of this was to___. A. heat up the flask to maximize the gas pressure

B. cool down the flask to maximize the gas pressure

C. keep the temperature constant so the collected
gas will not expand

C. keep the temperature constant so the collected  gas will not expand

Explanation:

A water bath is an instrument in the laboratory used for controlled temperature experiment. It is used to maintain a constant temperature of volume of samples of water, air or chemicals. It consist of water being heated at a regulated and required temperature. Where the volume of the sample is placed in the water bath during an experiment so as to avoid unnecessary expansion of the sample.

In the question given, the purpose of putting the flask in a water bath during the experiment is to ensure that the content of the flask is at a constant temperature and avoid unnecessary expansion. Thus the correct option is C.

beta decay is the answer

given:

mass of na = 115 g

excess cl2

to determine:

mass of nacl produced

explanation:

given reaction is-

2na(s) + cl2(g) → 2nacl(s)

since cl2 is in excess, na will be the limiting reagent

as per the reaction stoichiometry na: nacl = 1: 1

i.e. moles of na reacted = moles of nacl formed

now, # moles of na = mass of na/atomic mass

                                  = 115 g/23 g.mol-1 = 5 moles

therefore, moles of nacl = 5

molar mass of nacl = 58 g/mol

mass of nacl = 5 moles * 58 g.mol-1 = 290 g

ans: amount of nacl produced = 290 g