Answer:
4.22% NaBr
Explanation:
To find the mole fraction of NaBr, you need to (1) determine the mass of the solute (NaBr) and the solvent (H₂O), then (2) convert the mass of the solute and solvent to moles (via the molar masses), and then (3) calculate the mole fraction of NaBr. The final answer should have 3 sig figs to match the sig figs of the given value (20.1%). Because you are given a percent less than 100%, you can assume that the percent (20.1%) is equal to the mass of the solute (20.1 g).
<u>(Step 1)</u>
100% - 20.1 % NaBr = 79.9% H₂O
20.1% NaBr = 20.1 g NaBr
79.9% H₂O = 79.9 g H₂O
<u>(Step 2)</u>
Molar Mass (NaBr): 102.89 g/mol
20.1 g NaBr 1 mole
------------------- x --------------------- = 0.195 mole NaBr
102.89 g
Molar Mass (H₂O): 18.016 g/mol
79.9 g H₂O 1 mole
------------------ x ------------------- = 4.43 moles H₂O
18.016 g
<u>(Step 3)</u>
moles of solute
Mole Fraction = ---------------------------------------------------- x 100%
moles of solute + moles of solvent
0.195 mole NaBr
Mole Fraction = -------------------------------------------------------- x 100%
(0.195 mole NaBr) + (4.43 moles H₂O)
Mole Fraction = 4.22% NaBr
It’s 5 When u do 1k which is 1000 it’s equal to 0.1 then = 100 which then u do 95 coz that’s a lucky number and u get 5
Answer:
Explanation:
The interaction between the tectonic and the hydrologic systems causes constant recycling of the materials of the Earth's crust. ... Weathering and erosion at the earth's surface can break down rocks into small bits. These can be deposited as sediments that become sedimentary rocks.
Answer:
B. The substance is in the liquid state.
Explanation:
The symbol (l) in a chemical equation represents that the substance is in liquid state which is one of the physical states of a chemical substance.
Answer:
by repeating the experiment
Explanation:
sometimes repeating the experiment with multiple trials can help make the experiment worth it