Answer:
molarity of a solution = 1.192 M
Explanation:
- molarity [=] mol compound / L solution
∴ mass NaCl = 195 g
∴ molar mass NaCl = 58.44 g/mol
⇒ moles NaCl = (195 g)*(mol/58.44 g) = 3.34 mol
∴ Volumen solution = 2.8 L
⇒ Molarity NaCl solution = (3.34 mol)/(2.8 L) = 1.192 M
From the balanced equation, we can see that 1 mole of CH4
releases 802.3 kJ of heat upon combustion. The mass of 1 mole of CH4 is:
mass CH4 = 16.04 grams
So by ratio and proportion:
mass required = (-268 kJ) / (-802.3 kJ / 16.04 grams)
<span>mass required = 0.334 grams</span>
The molar mass or As is 74.9g. Start with 281g multiply by (1mol/74.9g) = 3.75 mols
Put what you don’t want on the bottom (in this case grams) so they the u it’s cancel (if you multiply by grams and the divide by grams they cancel. Ultimately leave what you want on the top ( This case mols) then do the math
2 atoms will bond with calcium to form Calcium Fluoride
Answer:
Explanation:
N₂O₄(g) ⇄ 2 NO₂
N₂O₄ reacted = .04 - .0055 = .0345 mole
NO₂ formed = 2 x .0345 = .069 moles
equilibrium constant = [ NO₂ ] ² / [ N₂O₄]
= .069² / .0055
= 0.865 .