un volum de 168 m3(c. n.) de gaz metan de puritate 80% se supune arderii cu o cantitate stoechiometrica de aer. calculeaza volumul de azot (80% n2 in aer) ce se separa in urma procesului de ardere. ce cantitate de apa de var de cp=40% este necesara pentru a absorbi total co2 rezultat la ardere? se dau : ac=12 ; ah=1 ; aca=40 ; ao=16 ; an=14

The mass of a neutron is equal to the mass of a proton plus the mass of an electron. true or false false true

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

Jenny wants to test the electrical conductivity of two substances dissolved in water. she is preparing the containers for the experiment. which factor is most important for her to control?