306828
The percentage composition of Cr in \({\mathrm{\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}}}\) is ____ \({\mathrm{\%}}\). (At. mass: \({\mathrm{\mathrm{K}=39 \mathrm{u} ; \mathrm{Cr}=52 \mathrm{u} ; \mathrm{O}=16 \mathrm{u}}}\) )
1 52
2 16.27
3 35.37
4 116
Explanation:
Molar mass of \({\mathrm{\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}=2 \times(39)}}\)\(+2 \times(52)+7 \times(16)\) \({\mathrm{78+104+112=294 \mathrm{~g} \mathrm{~mol}^{-1}}}\) Percentage of \({\mathrm{\mathrm{Cr}=\dfrac{104}{294} \times 100=35.37 \%}}\)
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY
306829
400 mg of a capsule contains 100 mg of ferrous fumarate. The percentage of iron present in the capsule is approximately
1 \(8.2\% \)
2 \(25\% \)
3 \(16\% \)
4 unpredictable
Explanation:
The molecular formula of ferrous fumarate is \({{\rm{C}}_{\rm{4}}}{{\rm{H}}_{\rm{2}}}{\rm{Fe}}{{\rm{O}}_{\rm{4}}}\) (Molecular weight = 170 g/mol) One molecule of ferrous fumarate contains one iron atom 170 g of ferrous fumarate contains 56 g of iron 100 mg of ferrous fumarate contains \(\frac{{{\rm{56 \times 100}}}}{{{\rm{170}}}}{\rm{ = 32}}{\rm{.9}}{\mkern 1mu} {\mkern 1mu} {\rm{mg}}{\mkern 1mu} {\mkern 1mu} {\rm{of}}{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\rm{iron}}\) % iron in the capsule \({\rm{ = }}\frac{{{\rm{Mass}}{\mkern 1mu} {\mkern 1mu} {\rm{of}}{\mkern 1mu} {\mkern 1mu} {\rm{iron}}{\mkern 1mu} {\mkern 1mu} {\rm{the}}{\mkern 1mu} {\mkern 1mu} {\rm{capsule}}}}{{{\rm{400}}}}{\rm{ \times 100}}\) \({\rm{ = }}\frac{{{\rm{32}}{\rm{.9}}}}{{{\rm{400}}}}{\rm{ \times 100 = 8}}{\rm{.2\% }}\)
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY
306830
A gas mixture contains 25% He and 75% \({\rm{C}}{{\rm{H}}_{\rm{4}}}\) by volume at a given temperature and pressure. The percentage by mass of methane in the mixture is approximately
1 \({\rm{25\% }}\)
2 \({\rm{92\% }}\)
3 \({\rm{8\% }}\)
4 \({\rm{75\% }}\)
Explanation:
\({\rm{75}}{\mkern 1mu} {\mkern 1mu} {\rm{mL}}{\mkern 1mu} {\mkern 1mu} {\rm{of}}{\mkern 1mu} {\mkern 1mu} {\rm{C}}{{\rm{H}}_{\rm{4}}}{\rm{ + 25}}{\mkern 1mu} {\mkern 1mu} {\rm{mL}}{\mkern 1mu} {\mkern 1mu} {\rm{of}}{\mkern 1mu} {\mkern 1mu} {\rm{He = 100ml}}{\mkern 1mu} {\mkern 1mu} {\rm{of}}{\mkern 1mu} {\mkern 1mu} {\rm{gas}}\). 16 g of \({\rm{C}}{{\rm{H}}_{\rm{4}}}\) has volume 22400 mL (At STP) Mass of \({\rm{C}}{{\rm{H}}_{\rm{4}}}\) has volume 22400 mL (At STP) Mass of \({\rm{C}}{{\rm{H}}_{\rm{4}}}\) by volume \({\rm{ = }}\frac{{{\rm{75 \times 16}}}}{{{\rm{22400}}}}{\rm{ = 0}}{\rm{.05357}}\) Mass of He by volume \({\rm{ = }}\frac{{{\rm{25 \times 4}}}}{{{\rm{22400}}}}{\rm{ = 0}}{\rm{.004464}}\) Mass percentage of \({\rm{C}}{{\rm{H}}_{\rm{4}}}\) \({\rm{ = }}\frac{{{\rm{0}}{\rm{.05357}}}}{{{\rm{0}}{\rm{.05357 + 0}}{\rm{.004464}}}}{\rm{ \times 100}} \approx {\rm{92\% }}\)
KCET - 2020
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY
306831
The percentage weight of Zn in white vitriol \({\rm{[ZnS}}{{\rm{O}}_{\rm{4}}}{\rm{.7}}{{\rm{H}}_{\rm{2}}}{\rm{O]}}\) is approximately equal to (Atomic mass of Zn = 65, S = 32, O = 16 and H = 1)
306828
The percentage composition of Cr in \({\mathrm{\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}}}\) is ____ \({\mathrm{\%}}\). (At. mass: \({\mathrm{\mathrm{K}=39 \mathrm{u} ; \mathrm{Cr}=52 \mathrm{u} ; \mathrm{O}=16 \mathrm{u}}}\) )
1 52
2 16.27
3 35.37
4 116
Explanation:
Molar mass of \({\mathrm{\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}=2 \times(39)}}\)\(+2 \times(52)+7 \times(16)\) \({\mathrm{78+104+112=294 \mathrm{~g} \mathrm{~mol}^{-1}}}\) Percentage of \({\mathrm{\mathrm{Cr}=\dfrac{104}{294} \times 100=35.37 \%}}\)
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY
306829
400 mg of a capsule contains 100 mg of ferrous fumarate. The percentage of iron present in the capsule is approximately
1 \(8.2\% \)
2 \(25\% \)
3 \(16\% \)
4 unpredictable
Explanation:
The molecular formula of ferrous fumarate is \({{\rm{C}}_{\rm{4}}}{{\rm{H}}_{\rm{2}}}{\rm{Fe}}{{\rm{O}}_{\rm{4}}}\) (Molecular weight = 170 g/mol) One molecule of ferrous fumarate contains one iron atom 170 g of ferrous fumarate contains 56 g of iron 100 mg of ferrous fumarate contains \(\frac{{{\rm{56 \times 100}}}}{{{\rm{170}}}}{\rm{ = 32}}{\rm{.9}}{\mkern 1mu} {\mkern 1mu} {\rm{mg}}{\mkern 1mu} {\mkern 1mu} {\rm{of}}{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\rm{iron}}\) % iron in the capsule \({\rm{ = }}\frac{{{\rm{Mass}}{\mkern 1mu} {\mkern 1mu} {\rm{of}}{\mkern 1mu} {\mkern 1mu} {\rm{iron}}{\mkern 1mu} {\mkern 1mu} {\rm{the}}{\mkern 1mu} {\mkern 1mu} {\rm{capsule}}}}{{{\rm{400}}}}{\rm{ \times 100}}\) \({\rm{ = }}\frac{{{\rm{32}}{\rm{.9}}}}{{{\rm{400}}}}{\rm{ \times 100 = 8}}{\rm{.2\% }}\)
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY
306830
A gas mixture contains 25% He and 75% \({\rm{C}}{{\rm{H}}_{\rm{4}}}\) by volume at a given temperature and pressure. The percentage by mass of methane in the mixture is approximately
1 \({\rm{25\% }}\)
2 \({\rm{92\% }}\)
3 \({\rm{8\% }}\)
4 \({\rm{75\% }}\)
Explanation:
\({\rm{75}}{\mkern 1mu} {\mkern 1mu} {\rm{mL}}{\mkern 1mu} {\mkern 1mu} {\rm{of}}{\mkern 1mu} {\mkern 1mu} {\rm{C}}{{\rm{H}}_{\rm{4}}}{\rm{ + 25}}{\mkern 1mu} {\mkern 1mu} {\rm{mL}}{\mkern 1mu} {\mkern 1mu} {\rm{of}}{\mkern 1mu} {\mkern 1mu} {\rm{He = 100ml}}{\mkern 1mu} {\mkern 1mu} {\rm{of}}{\mkern 1mu} {\mkern 1mu} {\rm{gas}}\). 16 g of \({\rm{C}}{{\rm{H}}_{\rm{4}}}\) has volume 22400 mL (At STP) Mass of \({\rm{C}}{{\rm{H}}_{\rm{4}}}\) has volume 22400 mL (At STP) Mass of \({\rm{C}}{{\rm{H}}_{\rm{4}}}\) by volume \({\rm{ = }}\frac{{{\rm{75 \times 16}}}}{{{\rm{22400}}}}{\rm{ = 0}}{\rm{.05357}}\) Mass of He by volume \({\rm{ = }}\frac{{{\rm{25 \times 4}}}}{{{\rm{22400}}}}{\rm{ = 0}}{\rm{.004464}}\) Mass percentage of \({\rm{C}}{{\rm{H}}_{\rm{4}}}\) \({\rm{ = }}\frac{{{\rm{0}}{\rm{.05357}}}}{{{\rm{0}}{\rm{.05357 + 0}}{\rm{.004464}}}}{\rm{ \times 100}} \approx {\rm{92\% }}\)
KCET - 2020
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY
306831
The percentage weight of Zn in white vitriol \({\rm{[ZnS}}{{\rm{O}}_{\rm{4}}}{\rm{.7}}{{\rm{H}}_{\rm{2}}}{\rm{O]}}\) is approximately equal to (Atomic mass of Zn = 65, S = 32, O = 16 and H = 1)
306828
The percentage composition of Cr in \({\mathrm{\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}}}\) is ____ \({\mathrm{\%}}\). (At. mass: \({\mathrm{\mathrm{K}=39 \mathrm{u} ; \mathrm{Cr}=52 \mathrm{u} ; \mathrm{O}=16 \mathrm{u}}}\) )
1 52
2 16.27
3 35.37
4 116
Explanation:
Molar mass of \({\mathrm{\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}=2 \times(39)}}\)\(+2 \times(52)+7 \times(16)\) \({\mathrm{78+104+112=294 \mathrm{~g} \mathrm{~mol}^{-1}}}\) Percentage of \({\mathrm{\mathrm{Cr}=\dfrac{104}{294} \times 100=35.37 \%}}\)
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY
306829
400 mg of a capsule contains 100 mg of ferrous fumarate. The percentage of iron present in the capsule is approximately
1 \(8.2\% \)
2 \(25\% \)
3 \(16\% \)
4 unpredictable
Explanation:
The molecular formula of ferrous fumarate is \({{\rm{C}}_{\rm{4}}}{{\rm{H}}_{\rm{2}}}{\rm{Fe}}{{\rm{O}}_{\rm{4}}}\) (Molecular weight = 170 g/mol) One molecule of ferrous fumarate contains one iron atom 170 g of ferrous fumarate contains 56 g of iron 100 mg of ferrous fumarate contains \(\frac{{{\rm{56 \times 100}}}}{{{\rm{170}}}}{\rm{ = 32}}{\rm{.9}}{\mkern 1mu} {\mkern 1mu} {\rm{mg}}{\mkern 1mu} {\mkern 1mu} {\rm{of}}{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\rm{iron}}\) % iron in the capsule \({\rm{ = }}\frac{{{\rm{Mass}}{\mkern 1mu} {\mkern 1mu} {\rm{of}}{\mkern 1mu} {\mkern 1mu} {\rm{iron}}{\mkern 1mu} {\mkern 1mu} {\rm{the}}{\mkern 1mu} {\mkern 1mu} {\rm{capsule}}}}{{{\rm{400}}}}{\rm{ \times 100}}\) \({\rm{ = }}\frac{{{\rm{32}}{\rm{.9}}}}{{{\rm{400}}}}{\rm{ \times 100 = 8}}{\rm{.2\% }}\)
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY
306830
A gas mixture contains 25% He and 75% \({\rm{C}}{{\rm{H}}_{\rm{4}}}\) by volume at a given temperature and pressure. The percentage by mass of methane in the mixture is approximately
1 \({\rm{25\% }}\)
2 \({\rm{92\% }}\)
3 \({\rm{8\% }}\)
4 \({\rm{75\% }}\)
Explanation:
\({\rm{75}}{\mkern 1mu} {\mkern 1mu} {\rm{mL}}{\mkern 1mu} {\mkern 1mu} {\rm{of}}{\mkern 1mu} {\mkern 1mu} {\rm{C}}{{\rm{H}}_{\rm{4}}}{\rm{ + 25}}{\mkern 1mu} {\mkern 1mu} {\rm{mL}}{\mkern 1mu} {\mkern 1mu} {\rm{of}}{\mkern 1mu} {\mkern 1mu} {\rm{He = 100ml}}{\mkern 1mu} {\mkern 1mu} {\rm{of}}{\mkern 1mu} {\mkern 1mu} {\rm{gas}}\). 16 g of \({\rm{C}}{{\rm{H}}_{\rm{4}}}\) has volume 22400 mL (At STP) Mass of \({\rm{C}}{{\rm{H}}_{\rm{4}}}\) has volume 22400 mL (At STP) Mass of \({\rm{C}}{{\rm{H}}_{\rm{4}}}\) by volume \({\rm{ = }}\frac{{{\rm{75 \times 16}}}}{{{\rm{22400}}}}{\rm{ = 0}}{\rm{.05357}}\) Mass of He by volume \({\rm{ = }}\frac{{{\rm{25 \times 4}}}}{{{\rm{22400}}}}{\rm{ = 0}}{\rm{.004464}}\) Mass percentage of \({\rm{C}}{{\rm{H}}_{\rm{4}}}\) \({\rm{ = }}\frac{{{\rm{0}}{\rm{.05357}}}}{{{\rm{0}}{\rm{.05357 + 0}}{\rm{.004464}}}}{\rm{ \times 100}} \approx {\rm{92\% }}\)
KCET - 2020
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY
306831
The percentage weight of Zn in white vitriol \({\rm{[ZnS}}{{\rm{O}}_{\rm{4}}}{\rm{.7}}{{\rm{H}}_{\rm{2}}}{\rm{O]}}\) is approximately equal to (Atomic mass of Zn = 65, S = 32, O = 16 and H = 1)
306828
The percentage composition of Cr in \({\mathrm{\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}}}\) is ____ \({\mathrm{\%}}\). (At. mass: \({\mathrm{\mathrm{K}=39 \mathrm{u} ; \mathrm{Cr}=52 \mathrm{u} ; \mathrm{O}=16 \mathrm{u}}}\) )
1 52
2 16.27
3 35.37
4 116
Explanation:
Molar mass of \({\mathrm{\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}=2 \times(39)}}\)\(+2 \times(52)+7 \times(16)\) \({\mathrm{78+104+112=294 \mathrm{~g} \mathrm{~mol}^{-1}}}\) Percentage of \({\mathrm{\mathrm{Cr}=\dfrac{104}{294} \times 100=35.37 \%}}\)
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY
306829
400 mg of a capsule contains 100 mg of ferrous fumarate. The percentage of iron present in the capsule is approximately
1 \(8.2\% \)
2 \(25\% \)
3 \(16\% \)
4 unpredictable
Explanation:
The molecular formula of ferrous fumarate is \({{\rm{C}}_{\rm{4}}}{{\rm{H}}_{\rm{2}}}{\rm{Fe}}{{\rm{O}}_{\rm{4}}}\) (Molecular weight = 170 g/mol) One molecule of ferrous fumarate contains one iron atom 170 g of ferrous fumarate contains 56 g of iron 100 mg of ferrous fumarate contains \(\frac{{{\rm{56 \times 100}}}}{{{\rm{170}}}}{\rm{ = 32}}{\rm{.9}}{\mkern 1mu} {\mkern 1mu} {\rm{mg}}{\mkern 1mu} {\mkern 1mu} {\rm{of}}{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\rm{iron}}\) % iron in the capsule \({\rm{ = }}\frac{{{\rm{Mass}}{\mkern 1mu} {\mkern 1mu} {\rm{of}}{\mkern 1mu} {\mkern 1mu} {\rm{iron}}{\mkern 1mu} {\mkern 1mu} {\rm{the}}{\mkern 1mu} {\mkern 1mu} {\rm{capsule}}}}{{{\rm{400}}}}{\rm{ \times 100}}\) \({\rm{ = }}\frac{{{\rm{32}}{\rm{.9}}}}{{{\rm{400}}}}{\rm{ \times 100 = 8}}{\rm{.2\% }}\)
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY
306830
A gas mixture contains 25% He and 75% \({\rm{C}}{{\rm{H}}_{\rm{4}}}\) by volume at a given temperature and pressure. The percentage by mass of methane in the mixture is approximately
1 \({\rm{25\% }}\)
2 \({\rm{92\% }}\)
3 \({\rm{8\% }}\)
4 \({\rm{75\% }}\)
Explanation:
\({\rm{75}}{\mkern 1mu} {\mkern 1mu} {\rm{mL}}{\mkern 1mu} {\mkern 1mu} {\rm{of}}{\mkern 1mu} {\mkern 1mu} {\rm{C}}{{\rm{H}}_{\rm{4}}}{\rm{ + 25}}{\mkern 1mu} {\mkern 1mu} {\rm{mL}}{\mkern 1mu} {\mkern 1mu} {\rm{of}}{\mkern 1mu} {\mkern 1mu} {\rm{He = 100ml}}{\mkern 1mu} {\mkern 1mu} {\rm{of}}{\mkern 1mu} {\mkern 1mu} {\rm{gas}}\). 16 g of \({\rm{C}}{{\rm{H}}_{\rm{4}}}\) has volume 22400 mL (At STP) Mass of \({\rm{C}}{{\rm{H}}_{\rm{4}}}\) has volume 22400 mL (At STP) Mass of \({\rm{C}}{{\rm{H}}_{\rm{4}}}\) by volume \({\rm{ = }}\frac{{{\rm{75 \times 16}}}}{{{\rm{22400}}}}{\rm{ = 0}}{\rm{.05357}}\) Mass of He by volume \({\rm{ = }}\frac{{{\rm{25 \times 4}}}}{{{\rm{22400}}}}{\rm{ = 0}}{\rm{.004464}}\) Mass percentage of \({\rm{C}}{{\rm{H}}_{\rm{4}}}\) \({\rm{ = }}\frac{{{\rm{0}}{\rm{.05357}}}}{{{\rm{0}}{\rm{.05357 + 0}}{\rm{.004464}}}}{\rm{ \times 100}} \approx {\rm{92\% }}\)
KCET - 2020
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY
306831
The percentage weight of Zn in white vitriol \({\rm{[ZnS}}{{\rm{O}}_{\rm{4}}}{\rm{.7}}{{\rm{H}}_{\rm{2}}}{\rm{O]}}\) is approximately equal to (Atomic mass of Zn = 65, S = 32, O = 16 and H = 1)
306828
The percentage composition of Cr in \({\mathrm{\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}}}\) is ____ \({\mathrm{\%}}\). (At. mass: \({\mathrm{\mathrm{K}=39 \mathrm{u} ; \mathrm{Cr}=52 \mathrm{u} ; \mathrm{O}=16 \mathrm{u}}}\) )
1 52
2 16.27
3 35.37
4 116
Explanation:
Molar mass of \({\mathrm{\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}=2 \times(39)}}\)\(+2 \times(52)+7 \times(16)\) \({\mathrm{78+104+112=294 \mathrm{~g} \mathrm{~mol}^{-1}}}\) Percentage of \({\mathrm{\mathrm{Cr}=\dfrac{104}{294} \times 100=35.37 \%}}\)
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY
306829
400 mg of a capsule contains 100 mg of ferrous fumarate. The percentage of iron present in the capsule is approximately
1 \(8.2\% \)
2 \(25\% \)
3 \(16\% \)
4 unpredictable
Explanation:
The molecular formula of ferrous fumarate is \({{\rm{C}}_{\rm{4}}}{{\rm{H}}_{\rm{2}}}{\rm{Fe}}{{\rm{O}}_{\rm{4}}}\) (Molecular weight = 170 g/mol) One molecule of ferrous fumarate contains one iron atom 170 g of ferrous fumarate contains 56 g of iron 100 mg of ferrous fumarate contains \(\frac{{{\rm{56 \times 100}}}}{{{\rm{170}}}}{\rm{ = 32}}{\rm{.9}}{\mkern 1mu} {\mkern 1mu} {\rm{mg}}{\mkern 1mu} {\mkern 1mu} {\rm{of}}{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\rm{iron}}\) % iron in the capsule \({\rm{ = }}\frac{{{\rm{Mass}}{\mkern 1mu} {\mkern 1mu} {\rm{of}}{\mkern 1mu} {\mkern 1mu} {\rm{iron}}{\mkern 1mu} {\mkern 1mu} {\rm{the}}{\mkern 1mu} {\mkern 1mu} {\rm{capsule}}}}{{{\rm{400}}}}{\rm{ \times 100}}\) \({\rm{ = }}\frac{{{\rm{32}}{\rm{.9}}}}{{{\rm{400}}}}{\rm{ \times 100 = 8}}{\rm{.2\% }}\)
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY
306830
A gas mixture contains 25% He and 75% \({\rm{C}}{{\rm{H}}_{\rm{4}}}\) by volume at a given temperature and pressure. The percentage by mass of methane in the mixture is approximately
1 \({\rm{25\% }}\)
2 \({\rm{92\% }}\)
3 \({\rm{8\% }}\)
4 \({\rm{75\% }}\)
Explanation:
\({\rm{75}}{\mkern 1mu} {\mkern 1mu} {\rm{mL}}{\mkern 1mu} {\mkern 1mu} {\rm{of}}{\mkern 1mu} {\mkern 1mu} {\rm{C}}{{\rm{H}}_{\rm{4}}}{\rm{ + 25}}{\mkern 1mu} {\mkern 1mu} {\rm{mL}}{\mkern 1mu} {\mkern 1mu} {\rm{of}}{\mkern 1mu} {\mkern 1mu} {\rm{He = 100ml}}{\mkern 1mu} {\mkern 1mu} {\rm{of}}{\mkern 1mu} {\mkern 1mu} {\rm{gas}}\). 16 g of \({\rm{C}}{{\rm{H}}_{\rm{4}}}\) has volume 22400 mL (At STP) Mass of \({\rm{C}}{{\rm{H}}_{\rm{4}}}\) has volume 22400 mL (At STP) Mass of \({\rm{C}}{{\rm{H}}_{\rm{4}}}\) by volume \({\rm{ = }}\frac{{{\rm{75 \times 16}}}}{{{\rm{22400}}}}{\rm{ = 0}}{\rm{.05357}}\) Mass of He by volume \({\rm{ = }}\frac{{{\rm{25 \times 4}}}}{{{\rm{22400}}}}{\rm{ = 0}}{\rm{.004464}}\) Mass percentage of \({\rm{C}}{{\rm{H}}_{\rm{4}}}\) \({\rm{ = }}\frac{{{\rm{0}}{\rm{.05357}}}}{{{\rm{0}}{\rm{.05357 + 0}}{\rm{.004464}}}}{\rm{ \times 100}} \approx {\rm{92\% }}\)
KCET - 2020
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY
306831
The percentage weight of Zn in white vitriol \({\rm{[ZnS}}{{\rm{O}}_{\rm{4}}}{\rm{.7}}{{\rm{H}}_{\rm{2}}}{\rm{O]}}\) is approximately equal to (Atomic mass of Zn = 65, S = 32, O = 16 and H = 1)