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# Answer to Question #98201 in Inorganic Chemistry for Shane Jessica Ballera

Question #98201
1. Calculate the percent composition by mass of nitric acid.

2. What is the percent composition of chromium in K2Cr2O7?

3. Find the following:
Given: Sodium Dihydrogen Phosphate, NaH2PO4

a.) formula weight
b.) percent composition of oxygen
c.) weight in grams of 2.7 moles
1
Expert's answer
2019-11-11T07:48:08-0500

Solution.

"w(E) = \\frac{Ar \\times n \\times 100}{M}"

1.

"w(H) = \\frac{1*1*100}{63} = 1.59 \\%"

"w(N) = \\frac{14*1*100}{63} = 22.22 \\%"

"w(O) = 100.00 \\% - 22.22 \\% - 1.59 \\% = 76.19 \\%"

2.

"w(Cr) = \\frac{2 \\times 52 \\times 100}{294} = 35.37 \\%"

3.

a)

"M(NaH2PO4) = 23 + (2 \\times 1) + 31 + (4 \\times 16) = 120 \\ g\/mol"

b)

"w(O) = \\frac{4 \\times 16 \\times 100}{120} = 53.33 \\%"

c)

"n = \\frac{m}{M}"

"m = n \\times M"

"m = 2.7 \\times 120 = 324.0 \\ g"

Answer:

1.

w(H) = 1.59 %

w(N) = 22.22 %

w(O) = 76.19 %

2.

w(Cr) = 35.37 %

3.

a)

M(NaH2PO4) = 120 g/mol

b)

w(O) = 53.33 %

c)

m (NaH2PO4) = 324 g

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