2. When 66.4 g of calcium reacts with hydrofluoric acid at 23.2 0 C and a pressure of 741 mm of Hg, how many liters of hydrogen gas will be produced

Great amounts of electromagnetic energy from our sun and other bodies in space travel through space. which is a logical conclusion about these electromagnetic waves? their energy must be very their frequency must be very low these waves can travel without a medium they only travel through a vacuum of space

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

Sum of brother and sisters age is 26. four times the brothers age is subtracted from three times the sisters age, the difference is 8. what are the ages of the brother and sister?