(?)Li2O + (?)H2O → (?)LiOH

what goes inside the question marks?

What mass of natural gas (ch4) must you burn to emit 276 kj of heat?

In the space, show a correct numerical setup for calculating the number of moles of co2 present in 11 grams of co2

Amedication is given at a dosage of 3.000 mg of medication per kg of body weight. if 0.1500 g of medication is given, then what was the patient's weight in pounds (lbs)? there are 453.59g in 1 lb.