Air is about 78% nitrogen gas (n2) by mass. the molar mass of nitrogen gas is 28.0 g/mol. a 100.0-g sample of air contains how many moles of nitrogen?

2.8
3.6
28
78

Acompany charges $0.10 for each letter engraved. bobby plans to spend no more than $5.00 on the engraving on a jewelry box. write and solve an inequality to find the maximum number of letters he can have engraved.

Calculate the annual effective interest rate of a 12 % nominal annual interest rate compound monthly

According to the national center for health statistics, in 1990, 28 % of babies in the united states were born to parents who were not married. throughout the 1990s, this increased by approximately 0.6 % per year. if this trend continues, in which year will 52 % of babies be born out of wedlock? in__52 % of babies will be born out of wedlock