2L of CO2 (excess) is pumped into a 200g solution of NaOH which has the percent by mass 3.2% to obtain a slat, Na2CO3.
a. Find mass of obtained salt.
b. Find volume the remained gas at STP.
(Na=23, C=12, O=16, at STP= 44g of CO2 has 22.4L)​