1.which of the following comparison statement is true about population growth of more developed countries? a. less developed countries have a higher rate of infant and maternal deaths than those of more developed countries. b. less developed countries do not have access to safe and reliable family-planning and health care as do more developed countries. c. less developed countries typically have higher birth rates and lower life expectancy than more developed countries.

The correct answer is B. Less developed countries do not have access to safe and reliable family-planning and health care as do more developed countries.

Explanation:

In general, less developed countries have higher population growth rates than developed countries do. This is because these countries lack developed medical centers capable of guiding their populations in terms of family planning, which means that pregnancy rates are higher due to ignorance and lack of availability of contraceptive methods. Likewise, these countries have high mortality rates, with which life expectancy tends to be lower than that of developed countries; This is also explained in the deficiencies of their health systems.

nacl is added to the aqueous of what? ? in order to get a proper answer you have to specify the exact composition of the aqueous solution.

1. for the first question, we must find the mass of the anhydrous salt, mgso₄. the molar mass for mgso₄·7h₂o is 246.47 g/mol, while that of mgso₄ is 120.37 g/mol.7.834 g mgso₄·7h₂o * 1 mol mgso₄·7h₂o/246.47 g * 1 mol mgso₄/1 mol mgso₄·7h₂o * 20.37 g mgso₄/mol = 0.647 g mgso₄

2. mass of water = mass of sample - mass of anhydrous salemass of water = 7.834 - 0.647 = 7.19 gpercent water in hydrate = 7.19/7.834 * 100 = 91.74%