What is the molar mass of a gas that has a mass of 0.261 g in a 0.134 l vessel at 397 k, 0.992 atm? view available hint(s) what is the molar mass of a gas that has a mass of 0.261 g in a 0.134 l vessel at 397 k, 0.992 atm? 1.15 g/mol 9.49 × 103g/mol 64.0 g/mol 171 g/mol?

Compare and contrast physical changes with chemical changes.

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]

How many moles of lead are in 1.50 x 10^12 atoms of lead? could you explain the answer as well and not just give it to me i am refreshing for finals and i need to know how to do it