Can someone plz do my written response plz if you do it I will give you 10 points

Which statement is true about ionic compounds?

7. what temperature is need to just dissolve 50 g of nh4cl in 75 g of water? '

The yearly amounts of carbon emissions from cars in belgium are normally distributed with a mean of 13.9 gigagrams per year and a standard deviation of 5.8 gigagrams per year. find the probability that the amount of carbon emissions from cars in belgium for a randomly selected year are between 11.5 gigagrams and 14.0 gigagrams per year. a. 0.340 b. 0.660 c. 0.167 d. 0.397