Pb(NO3)2
how do i solve this

You can see the periodic table one by one.

Pb(NO3)2 = PbN2O6

So there are

1Pb

2N

6O

and so you find the molecular mass from the periodic table and add all the numbers

Molacular mass of

Pb = 207

N = 14

O = 16

multiply it with the number of atoms

1Pb = 207 × 1 = 207

2N = 14 × 2 = 28

6O = 16 × 6 = 96

Molecular mass total = 207 + 28 + 96 = 331

So the molecular mass is 331.

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

i would say b

explanation:

but i think i would need more information than that