How many liters of 15% acid and 33% acid should be mixed to make 40 liters of 21% acid solution?

What is the molar mass of a gas that has density of 2.054 g/l

Ineed this asap part i: scientific method what is the difference between science and pseudoscience? what is the scientific method?

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