Hi help plz, if you can A helium balloon has a volume of 23.6 L
when the pressure is 1.289 atm and the temperature is 16 ◦C. The balloon is cooled at
a constant pressure until the temperature is
−10◦C. What is the volume of the balloon at
this stage?
Answer in units of L.

Plz me ! 1 which of earths spheres contains most of its mass? a atmosphere b hydrosphere c geosphere* d biosphere 2 erosion and weathering are examples of which types of forces? a constructive forces b destructive forces* c gravitational forces d inertia-related forces 3 which of the following statements about earths atmosphere is true? a earths atmosphere contains 78% water vapor which is essentail to life b earths atmosphere contains 21% oxygen c earths atmosphere contains carbon dioxide which all life forms require d earths atmosphere allows radiation from the sun to pass through it and warm earths surface* 4 the strenght of the force of gravity between two objects is determined by which of the following factors? select all that apply a the messes of the objects* b the distance between the objects* c the volumes of the objects d the surface area of the objects 5 earth and moon are kept in there respective orbits due to the influence of a inertia b gravity c gravity and inertia* d neither gravity or inertia if you answer all questions right i will give

Use the periodic table to determine how many grams of oxygen would be required to react completely with 859.0 g c2h2

Which of the four hypothetical substances you investigated would be most harmful to living organisms? 50 points!