a mixture of NaCl and NaBr has a mass of 2.06 g and is found to contain 0.75 g of na
what is the mass of NaBr in the mixture ?
SciMann
Best Answer - Chosen by Voters
Let UNITs guide you; always USE THEM in your calculation to prevent errors
moles of Na in samp = 0.78 g/ atwt Na = ??
x moles NaBr * MW NaBr + (moles Na - x moles NaBr) * MW NaCl = 2.01 g
x moles NaBr = [2.01 g - moles Na * MW NaCl] / [MW NaBr - MW NaCl] = ??
g NaBr = x moles NaBr * MW NaBr
wt fraction = g NaBr/2.01g = ?? (0.049 wt fraction of NaBr)
Plug and SOLVE
Or do you need more than this?
.04
To solve this problem, we can use the concept of mass percent and proportion. The mass percent of an element in a compound is the mass of that element divided by the total mass of the compound, multiplied by 100.
Let's assume the mass of NaCl in the mixture is x grams and the mass of NaBr is y grams.
Given:
Total mass of the mixture = 2.06 g
Mass of Na = 0.75 g
To find the mass of NaBr, we need to subtract the mass of Na from the total mass of the mixture.
First, let's find the mass of Cl in the mixture:
Total mass of the mixture - Mass of Na = Mass of Cl + Mass of Br
2.06 g - 0.75 g = Mass of Cl + Mass of Br
1.31 g = Mass of Cl + Mass of Br
Now, we need to use mass percent to find the mass of Br in the mixture:
Mass percent of Br = (Mass of Br / Total mass of the mixture) * 100
Since the mixture contains only NaCl and NaBr, the mass percent of Br can be calculated as follows:
Mass percent of Br = 100 - Mass percent of Cl
To find the mass of Cl, we need to subtract the mass of Br from the previously calculated equation:
Mass of Cl = 1.31 g - Mass of Br
Now, substitute the values into the equation:
100 - Mass percent of Cl = 100 - [(Mass of Cl / Total mass of the mixture) * 100]
100 - Mass percent of Cl = 100 - [(1.31 g - Mass of Br) / 2.06 g] * 100
Simplifying the equation, we have:
Mass percent of Br = 100 - (100 - [(1.31 g - Mass of Br) / 2.06 g] * 100)
Next, let's solve for the mass percent of Br:
Mass percent of Br = 100 - (100 - [(1.31 g - Mass of Br) / 2.06 g] * 100)
Mass percent of Br = (1.31 g - Mass of Br) / 2.06 g * 100
To find the mass of Br, first convert the mass percent into a decimal:
Mass percent of Br = (1.31 g - Mass of Br) / 2.06 g * 100
(1.31 g - Mass of Br) * 100 = Mass of Br * 2.06 g
131 g - 100 Mass of Br = 2.06 Mass of Br
131 g = 2.06 Mass of Br + 100 Mass of Br
131 g = 102.06 Mass of Br
Mass of Br = 131 g / 102.06
Finally, we can calculate the mass of NaBr in the mixture:
Mass of NaBr = Mass of Br - Mass of Na
Substitute the values:
Mass of NaBr = (131 g / 102.06) - 0.75 g
Calculating this equation gives us the mass of NaBr in the mixture.