With molarity? what mass of water must be used to dissolve 500g c2h5oh to prepare a 3.00 m solution?
2.6 kg

1.65 kg

5.2 kg

3.87 kg
what is the molality of a solution that contains 80.0 g al2(so4)3 in 625 g h2o?
0.578 m

0.476 m

0.374 m

0.213
25 g of naoh is dissolved in 120 g of water. what is the molality?
5.21 m

4.16 m

3.74 m

7.32 m

a: 45.9 meters

b: 4.29 seconds

step-by-step explanation:

a: h(t)=1/2(-9.8)(3)^2+0(3)+90

h(t)=-4.9(3)^2+90

h(t)=-44.1+90

h(t)=45.9 meters

b: 0=1/2(-9.8)(t^2)+0t+90

0=-4.9t^2+90

-90=-4.9t^2

18.37=t^2

t=4.29 seconds

in the second question, the numbers aren't exact, but they're a close approximation.

the ideal gas law equation is as follows

pv = nrt

where p - pressure

v - volume

n - number of moles

r - universal gas constant

t - temperature

so if the pressure, volume and temperature are already known

we are left with n and r

since r is the universal gas constant that has a known fixed value then r too is known

so we are left with 'n'

once we know temperature volume and pressure

we can find the number of moles of gas present using the ideal gas law equation

this is not my own answer, this is an answer for the same question by the user blahblahmali. i do not claim ownership of this account.