Percent Return
1
) When copper is heated up in air, copper(II) oxide is created. In an experiment, 1.50 g copper was heated up to produce 1.76 g copper(II) oxide. What is the percent return?
(a) 1.50%
(b) 85.0%
(c) 94.0%
(d) 100%
(e) 117%
2
) Magnesium hydroxide is generated by responding magnesium oxide with excess water. If the response has an anticipated return of 81%, just how much magnesium oxide should be responded to create 98.0 g of magnesium hydroxide?
MgO(s)
Mg(OH )2( s
) (a)175
g
( b) 83.6 g(c)67.7 g(d )121 g(e)77.6 g 3)The response listed below has actually an anticipated return of 58 %. Just how much hydrochloric acid should be responded with excess oxygen to generate 44.0 g of chlorine gas?
4HCl(aq) + O2(g) 2Cl2(g) + 2H2O(l)
(a) 73.7 g
(b) 75.8 g
(c) 26.2 g
(d) 45.2 g
(e) 78.0 g
4
) If you respond 8.60 g of antimony with 11.4 g of iodine and also recuperate 10.9 g of antimony iodide, what is the percent return of antimony iodide?
2Sb(s) + 3I2(s) 2SbI 3(s )(a)30.7%
(b) 127%
(c) 72.7%
(
d ) 95.6 %(e )54.5%5 )Calcium oxide and also water are created by home heating calcium hydroxide. If the response has an anticipated return of 60%, just how much calcium hydroxide should be responded to generate 115 g of calcium oxide?
Ca(OH)2(aq)
CaO(s) +H 2 O
(l) (a) 254 g
(b) 152 g
(
c ) 145 g( d)192 g (e )92.1 g 6)If you respond 5.60 g of ammonia with 31.7 g of copper oxide and also recoup 3.48 g of nitrogen gas, what is the percent return of nitrogen gas?
2NH3(aq) + 3CuO(s)
N 2(g)
+3Cu(s )+3H 2 O(
l) (a)75.5%
(b) 62.1%
(
c ) 11.0 %( d)93.5% (e)9.33%7 )If you respond 14.1 g of hydrazine with 15.6 g of dinitrogen tetroxide as well as recoup 13.8 g of nitrogen gas, what is the percent return of nitrogen gas?
2N2H4(l) + N2O4(g)
3N 2(g )+4H 2 O(
l) (a)75.0%
(b) 88.5%
(
c ) 91.0 %(d) 46.5 %(e)97.2%8)When silicon is responded with chlorine gas, silicon tetrachloride is developed. In an offered experiment, 1.50 g silicon was responded to produce 7.76 g silicon tetrachloride. What is the percent return?
(a) 100%
(b) 86%
(c) 19%
(d) 3.0%
9
) The response listed below has actually an anticipated return of 63%. Just how much silicon dioxide should be responded with excess carbon as well as calcium phosphate to generate 60.0 g of phosphorous?
Ca3(PO4)2(s) + 3SiO2(s) + 5C(s)
5CO(g
) +3CaSiO 3( s
) +2P(s )
(
a ) 175 g( b)95.2 g (c)110. g (d )277 g(e)174 g 10 )If you respond 6.20 g of silicon with 5.30 g of nitrogen gas and also recuperate 4.90 g of silicon nitride, what is the percent return of silicon nitride?
3Si(s) + 2N2(g)
Si 3 N 4(s)(
a) 47.6%
(b) 36.8%
(c) 92.5%
(d) 79.0%
( e
