Stoichiometry Practice
A) Na2SiO3 + 8 HE => H2SiF6 + 2 NaF + 3 H2O
1) How many moles of HE are needed to react in order to produce 1.5 moles
of water(H20)?
2) How many grams of Naf form when 0.500 mol of HE reacts?
3) How many grams of Na2SiO3 are needed to produce 10 g of NaF?
B) Pb(SO4)2 + 4 LINO3 = Pb(NO3)4 + 2 Li2SO4
1) How many grams of LINO3 will be needed to make 250 grams of Li2SO4?
2) How many grams of Pb(SO4)2 are needed to produce.75 mol of Pb(NO3)4?
C) 2 C6H10 + 17 02= 12 CO2 + 10 H2O
1) How many grams of Co, are formed from the reaction of 10 grams of
hexyne(C6H10)?
2) How many grams of water are produced from the reaction of 10 grams of
hexyne(C6H10)?

first let us lay out the formula for potential

and kinetic energy:

pe = mgh

ke = (mv^2)/2

where: m=mass, v=velocity, g=gravitational

acceleration, h=height

calculating for mass using the known values of

pe:

340j = m (9.81 m/s^2) (50ft) (1m/3.28ft)

m = 2.27 kg

the law of conservation of energy states that

energy is neither created nor destroyed. therefore, the change in kinetic

energy from 50 ft to 35 ft would be equal to the change in potential energy

from 50 ft to 35 ft. however it would be opposite in signs since one is losing

while other is gaining.

ke(35ft) – ke(50ft) = - [ pe(35ft) – pe(50ft]

ke(50ft) = 0 since the brick is initially at rest

ke(35ft) = 340j - 2.27kg (9.81 m/s^2) (35ft)

(1m/3.28 ft)

ke(35ft)

= 102.38 j

the correct answer would be d. hope this !

the electron configuration that you gave me has 16 electrons ergo it has 16 protons ergo it is the element sulfur.