Mathway | Popular Problems

Popular Problems

Rank	Topic	Problem	Formatted Problem
1001	Balance	H_2+O_2=H_2O	$H_{2} + O_{2} = H_{2} O$
1002	Balance	H_2O+O_2→H_2O_2	$H_{2} O + O_{2} \to H_{2} O_{2}$
1003	Balance	H_2SO_4+NaOH→Na_2SO_4+H_2O	$H_{2} S O_{4} + N a O H \to N a_{2} S O_{4} + H_{2} O$
1004	Balance	FeS+O_2→Fe_2O_3SO_2	$F e S + O_{2} \to F e_{2} O_{3} S O_{2}$
1005	Balance	HgO→Hg+O_2	$H g O \to H g + O_{2}$
1006	Balance	HIO_3+FeI_2+HCl→FeCl_3+ICl+H_2O	$H I O_{3} + F e I_{2} + H C l \to F e C l_{3} + I C l + H_{2} O$
1007	Balance	HNO_2→HNO_3+NO+H_2O	$H N O_{2} \to H N O_{3} + N O + H_{2} O$
1008	Balance	HNO_3+NaHCO_3→NaNO_3+H_2O+CO_2	$H N O_{3} + N a H C O_{3} \to N a N O_{3} + H_{2} O + C O_{2}$
1009	Balance	Hs_2Sn_4+B(nH)_3→B_2(Sn_4)_3+H_2n	$H s_{2} S n_{4} + B {(n H)}_{3} \to B_{2} {(S n_{4})}_{3} + H_{2} n$
1010	Balance	KCIO_3→KCL+O_2	$K C I O_{3} \to K C L + O_{2}$
1011	Balance	KCl_3→KCl+O_2	$K C l_{3} \to K C l + O_{2}$
1012	Balance	KClO_3→KCl+O_3	$K C l O_{3} \to K C l + O_{3}$
1013	Balance	K+MgBr_2→KBr+Mg	$K + M g B r_{2} \to K B r + M g$
1014	Balance	Hcl+NaOH→na+h_2o	$H c l + N a O H \to n a + h_{2} o$
1015	Balance	K+Cl_2→KCl	$K + C l_{2} \to K C l$
1016	Balance	K+H_2O→KOH+H_2	$K + H_{2} O \to K O H + H_{2}$
1017	Balance	K_4Fe(CN)_6+K(MN)O_4+H_2SO_4+O_2→KHSO_4+Fe_2(SO_4)_3+MnSO_4+HNO_3+CO_2+H_2O	$K_{4} F e {(C N)}_{6} + K M N O_{4} + H_{2} S O_{4} + O_{2} \to K H S O_{4} + F e_{2} {(S O_{4})}_{3} + M n S O_{4} + H N O_{3} + C O_{2} + H_{2} O$
1018	Balance	KClO_3=KCl+O_2	$K C l O_{3} = K C l + O_{2}$
1019	Balance	N_2O_5+H_2O→HNO_3	$N_{2} O_{5} + H_{2} O \to H N O_{3}$
1020	Balance	Na_2CO_3+CaCl_2→2NaCl+CaCO_3	$N a_{2} C O_{3} + C a C l_{2} \to 2 N a C l + C a C O_{3}$
1021	Find the Moles	How many mol of NaC_7H_5O_2 should be added to 150mL of a*0.15MHC_7H_5O_2 solution in order to obtain a buffer with aPH of 4.25 The ka for HC_7HO_2 is 6.3	How many moles of $N a C_{7} H_{5} O_{2}$ should be added to $150 mL$ of $a \cdot 0.15 M H C_{7} H_{5} O_{2}$ solution in order to obtain a buffer with $a P H$ of $4.25$ The $k a$ for $H C_{7} H O_{2}$ is $6.3$
1022	Balance	N_2H_4+N_2O_4→N_2+H_2O	$N_{2} H_{4} + N_{2} O_{4} \to N_{2} + H_{2} O$
1023	Balance	Mg+Cl_2→MgCl_2	$M g + C l_{2} \to M g C l_{2}$
1024	Balance	Li+N_2→Li_3N	$L i + N_{2} \to L i_{3} N$
1025	Balance	Mg+HCL=MgCl+H	$M g + H C L = M g C l + H$
1026	Balance	Mg+HNO_3→Mg(NO_3)_2+H_2	$M g + H N O_{3} \to M g {(N O_{3})}_{2} + H_{2}$
1027	Balance	Mg+O→MgO	$M g + O \to M g O$
1028	Balance	NH_3+O_2+CH_4→HCN+H_2O	$N H_{3} + O_{2} + C H_{4} \to H C N + H_{2} O$
1029	Balance	NH_4NO_3→N_2O+H_2O	$N H_{4} N O_{3} \to N_{2} O + H_{2} O$
1030	Balance	NH_3→N_2+H_2	$N H_{3} \to N_{2} + H_{2}$
1031	Balance	NaOH+H_2SO_4→Na_2SO_4+H_2O	$N a O H + H_{2} S O_{4} \to N a_{2} S O_{4} + H_{2} O$
1032	Balance	NH_4OH+H_3PO_4→(NH_4)_3PO_4+H_2O	$N H_{4} O H + H_{3} P O_{4} \to {(N H_{4})}_{3} P O_{4} + H_{2} O$
1033	Balance	NaCIO→NaCIO_3+NaCI	$N a C I O \to N a C I O_{3} + N a C I$
1034	Balance	NaCl+F_2→NaF+Cl_2	$N a C l + F_{2} \to N a F + C l_{2}$
1035	Balance	Na+O_2→Na_2O	$N a + O_{2} \to N a_{2} O$
1036	Balance	Na_2O+P_4O_10→Na_3PO	$N a_{2} O + P_{4} O_{10} \to N a_{3} P O$
1037	Balance	NaH+H_2O→NaOH+H_2	$N a H + H_{2} O \to N a O H + H_{2}$
1038	Balance	NaCl+BaI_2→BaCl+NaI	$N a C l + B a I_{2} \to B a C l + N a I$
1039	Balance	NaClO_3→NaCl+O_2	$N a C l O_{3} \to N a C l + O_{2}$
1040	Balance	naoh (aq)+ca_2(g)→na_2co(aq)+h_2o(l)	naoh $(a q) + c a_{2} (g) \to n a_{2} c o (a q) + h_{2} o (l)$
1041	Balance	P_4+O_2→P_4O_10	$P_{4} + O_{2} \to P_{4} O_{10}$
1042	Balance	P+O_2→P_2O_5	$P + O_{2} \to P_{2} O_{5}$
1043	Balance	O_3+NO→O_2+NO_2	$O_{3} + N O \to O_{2} + N O_{2}$
1044	Balance	SiO_2+HF→SiF_4+H_2O	$S i O_{2} + H F \to S i F_{4} + H_{2} O$
1045	Balance	Pb(OH)_4+Cu_2O→PbO_2+CuOH	$P b {(O H)}_{4} + C u_{2} O \to P b O_{2} + C u O H$
1046	Balance	Si_2H_3+O_2→SiO_2+H_2O	$S i_{2} H_{3} + O_{2} \to S i O_{2} + H_{2} O$
1047	Balance	S_8+Na_2SO_3+H_2O→Na_2S_2O_3(H_2O)_5	$S_{8} + N a_{2} S O_{3} + H_{2} O \to N a_{2} S_{2} O_{3} {(H_{2} O)}_{5}$
1048	Balance	S+H_2SO_4→SO_2+H_2O	$S + H_{2} S O_{4} \to S O_{2} + H_{2} O$
1049	Balance	Zn+CuSO_4→ZnSO_4+CU	$Z n + C u S O_{4} \to Z n S O_{4} + C U$
1050	Balance	Zn+H_2SO_4→ZnSO_4+H_2	$Z n + H_{2} S O_{4} \to Z n S O_{4} + H_{2}$
1051	Balance	Zn+HCl→ZnCl+H_2	$Z n + H C l \to Z n C l + H_{2}$
1052	Balance	Zn+HCI→ZnCL_2+H_2	$Z n + H C I \to Z n C L_{2} + H_{2}$
1053	Balance	zn+hcl→zncl_2+h_2	$z n + h c l \to z n c l_{2} + h_{2}$
1054	Balance	V_2O_5+CaS→CaO+V_2S_5	$V_{2} O_{5} + C a S \to C a O + V_{2} S_{5}$
1055	Balance	NH_4OH+AlCl_3→Al(OH)_3+NH_4Cl	$N H_{4} O H + A l C l_{3} \to A l {(O H)}_{3} + N H_{4} C l$
1056	Balance	C_2H_6+O_2→H_2O+CO_2	$C_{2} H_{6} + O_{2} \to H_{2} O + C O_{2}$
1057	Balance	C_2H_5OH+O_2=CO_2+H_2O	$C_{2} H_{5} O H + O_{2} = C O_{2} + H_{2} O$
1058	Balance	AgNO_3+CaCl_2=CaN_2O_6+AgCl_2	$A g N O_{3} + C a C l_{2} = C a N_{2} O_{6} + A g C l_{2}$
1059	Balance	Ca+H_2O→Ca(OH_2)+H_2	$C a + H_{2} O \to C a (O H_{2}) + H_{2}$
1060	Find the Concentration	number (of)Ni(atoms)in*3.4(mol)(of)Ni	number $(o f) N i (a t o m s) i n \cdot 3.4 (m o l) (o f) N i$
1061	Balance	CuCl_2+Na_3PO_4→NaCl_3+Cu_4PO	$C u C l_{2} + N a_{3} P O_{4} \to N a C l_{3} + C u_{4} P O$
1062	Balance	4Zn+4HCl→4ZnCl+2H_2	$4 Z n + 4 H C l \to 4 Z n C l + 2 H_{2}$
1063	Balance	Zn+S→ZnS	$Z n + S \to Z n S$
1064	Balance	NO_2→N_2+O_2	$N O_{2} \to N_{2} + O_{2}$
1065	Balance	NH_3+H_2O→NH_3OH	$N H_{3} + H_{2} O \to N H_{3} O H$
1066	Balance	K+N_2→K_3N	$K + N_{2} \to K_{3} N$
1067	Balance	PbO_2→PbO+O_2	$P b O_{2} \to P b O + O_{2}$
1068	Balance	given (that)((12,1),lies)(on)(the)(line)(with)(equation)y=kx-11(find)(the)(value)(of)k	given $(t h a t) ((12, 1) l i e s) (o n) (t h e) (l i n e) (w i t h) (e q u a t i o n) y = k x - 11 (f i n d) (t h e) (v a l u e) (o f) k$
1069	Balance	HCl+CaCn_3→CaCl_2+H_2n+Cn_2	$H C l + C a C n_{3} \to C a C l_{2} + H_{2} n + C n_{2}$
1070	Balance	NaOH+HCI→NaCl+H_2O	$N a O H + H C I \to N a C l + H_{2} O$
1071	Balance	FeOH_3+H_2→Fe+H_2O	$F e O H_{3} + H_{2} \to F e + H_{2} O$
1072	Balance	H_2O→H_2+O_2	$H_{2} O \to H_{2} + O_{2}$
1073	Find the Mass Percentages	CH_4	$C H_{4}$
1074	Find the Oxidation Numbers	MgOs	$M g O s$
1075	Find the Oxidation Numbers	Mt_8	$M t_{8}$
1076	Find the Oxidation Numbers	N_2	$N_{2}$
1077	Find the Oxidation Numbers	NaBr	$N a B r$
1078	Find the Oxidation Numbers	O_2	$O_{2}$
1079	Find the Oxidation Numbers	PbO_2	$P b O_{2}$
1080	Find the Oxidation Numbers	KNO_3	$K N O_{3}$
1081	Find the Oxidation Numbers	Ir	$I r$
1082	Find the Oxidation Numbers	KClO_3	$K C l O_{3}$
1083	Find the Oxidation Numbers	HHO	$H H O$
1084	Find the Oxidation Numbers	K_2CrO_4	$K_{2} C r O_{4}$
1085	Find the Oxidation Numbers	Mg_3N_2	$M g_{3} N_{2}$
1086	Find the Oxidation Numbers	Mn	$M n$
1087	Find the Oxidation Numbers	HC	$H C$
1088	Find the Oxidation Numbers	HO	$H O$
1089	Find the Oxidation Numbers	NaS	$N a S$
1090	Find the Oxidation Numbers	Nb	$N b$
1091	Find the Oxidation Numbers	Sc_0	$S c_{0}$
1092	Find the Oxidation Numbers	Si	$S i$
1093	Find the Oxidation Numbers	Ti	$T i$
1094	Find the Oxidation Numbers	XeF_4	$X e F_{4}$
1095	Find the Oxidation Numbers	Zn	$Z n$
1096	Find the Number of Molecules	how many(ato(ms))(is) in (10g)(of)K	how $(m a n y) (a t o m s) (i s)$ in $(10 g) (o f) K$
1097	Find the Density at STP	4.00 gHe	$4$ gHe
1098	Find the Density at STP	CCl_4	$C C l_{4}$
1099	Find the Density at STP	Al	$A l$
1100	Find the Density at STP	Cr	$C r$