Water exists as a solid, liquid, and gas on Earth. It is the only substance that naturally exists in all three states within the relatively small range of air temperatures and pressures found at the Earth's surface. How is this property of water central to the planet's dynamics? 1.By changing states, water can evaporate and transpire into the atmosphere. 2.By changing states, water can condense and travel from the atmosphere to Earth's surface. 3.By changing states, water can fall as precipitation that and cause erosion and weathering of Earth's surface. A. 1 only B. 1 and 2 C. 2 and 3 D.1,2 and 3

d: the voltage of the secondary coil is less than that of the primary coil.

im not suree sorry if wrong

as given the equation is

2al + 6 hcl > 2 alcl3 + 3 h2(g)

as per equation two moles of aluminum reacts with six moles of hcl to give two moles of alcl3 and three moles of hydrogen gas

given: three moles of al are present and 7 moles of hcl

for three moles of aluminum nine moles of hcl will be required

however as 7 moles of hcl are present so the limiting reagent is hcl

hcl is going to decide the number of moles of product formed

when six moles of hcl are present = 3 moles of h2 are formed

when one mole of hcl is present == 3/6 mole sof h2 will be formed

when 7 moles of hcl are present = 3 x 7/ 6 moles of h2 will be formed = 3.5 moles of h2