Calculate the mass of Na2O needed to release 105 kJ of heat energy according to the following reaction: Na2O (s) + 2HI (g) → 2NaI (s) + H2O (l) ΔH = -502 kJ

13.0 g
155 g
97.4 g
24.8 g

i think its 100

i hope this !

here is table 2-2:

country

percent of eligible voters that voted

rank

united states

44.9%

138

canada

60.1%

107

costa rica

84.6%

14

hungary

66.9%

82

japan

57.0%

118

egypt

27.7%

159

south africa

85.5%

10

ans is no, the data set cannot be plotted as a single circle graph

weight of any object is given by

w = m*g

where m is mass of the object and g is the acceleration due to gravity.

for earth the value of g is 9.8 m/s^2 so

w=117.6 n m=12 g=?

117.6=12g => g=9.8 m/s^2

which is the force of gravity on earth.