Asample of a solid labeled as nacl may be impure. a student analyzes the sample and determines that it contains 75 percent chlorine by mass. pure nacl contains 61 percent chlorine by mass. which of the following statements is consistent with the data?
a- the sample contains only nacl
b- the sample contains nacl and nai
c- the sample contains nacl and kcl
d- the sample contains nacl and licl

Consider the four elements above. which one of these elements will combine with oxygen in a 1: 1 ratio?

Answer asap need it by wednesday morning carry out the following calculations on ph and ka of from data. i. calculate the ph of 0.02m hcl ii. calculate the ph of 0.036m naoh iii. calculate the ph of 0.36m ca(oh)2 iv. calculate the ph of 0.16m ch3cooh which has ka = 1.74 x 10-5 mol dm-3 v. calculate ka for weak acid ha which has a ph of 3.65 at 0.30m concentration vi. calculate the ka of a solution made by mixing 15.0 cm3 0.2m ha and 60.0 cm3 0.31m a-. [ph= 3.80] vii. calculate the ph of a solution made by mixing 15.0 cm3 0.1m naoh and 35.0 cm3 0.2m hcooh. [ka = 1.82 x 10-4 m]

When the mercury level in a barometer decreases that atmospheric pressure has