Because they didn’t go extinct at the same time
Wavelength because it is shorter
Answer:
MgCl2 - 6H2O
203.3 mol
MgCl2 + 2Na = 2NaCl + Mg
22.6g
Explanation:
1. Write the formula of hydrate and find molar mass.
2. Write a balanced single replacement (don't include H2O)
3. Do the given/wanted calculation (include H2O in molar mass of given)
Ideal gas law: PV = nRT
P-pressure
V-volume
n-number of moles(m/M)
R-constant
T- temperature
State given info:
V=10L
T=298k
P=203kPa
R=8.31(only for kPa, for pressure at atm use 0.08206)
Sub in:
(203kPa)(10L)=n(8.31)(298)
Rearrange:
n= (203)(10) / (8.31)(298)
n = 0.819745mol in gas sample
