Question

FORMA 10) 6 moles of H2 will make how many moles of CHO, a)6 b) 12 c) 0.5 d) 1 e) 2 11. In which case is the element correctly matched with its combining ability? a) K:+ b) Mg: +2 c) Al: +3 d) a & b e), b, & c 12 Based on your knowledge of the periodic table, which would be a correct formula? a) CaS b) NaBr c) GaC e) Al,O d) Lis 13 When the chemical equation N;H, +O,NO, + 1,0 is balanced with the smallest set of whole number coefficients, there will be a in front of O c) 3 a) b) 2 d) 4 e) 5 For questions 14 & 15 consider the following balanced cquation: 2K + 2H,0 2KOH+ H 14. 19.55 g of potassium will require how many grams of watcr to rcact completely? c) 36.0 g a) 9.00 g b) 18.0 g d) 72.0 g 22.4 g 15. Given as much potassium as you want, 18.0 g of water will produce how many moles of Hy7 (a)18 mol d) 0.50 mol b) 9.0 mol c) 1.0 mol e) 2.0 mol 16. 250.g of a 7.00 % m / m solution of NaCl in water will contain how many grams of NaC1? e) 25.0 g 2s0 e) 233 g x 7.001 a) 7.00 g b) 17.5 g a)175 g 1353 17. How would you prepare 250 ml) of a 0.200 M NayCO, solution? (NaCO, has 106 g/1 mol) a) dissolve 21.2 g of Na,CO, in 250 mL of water b) dissolve 21.2 g of Na-CO, in water and then add water to make the volume 250 mL c) dissolve 26.5 g of Na,CO, in water and then add water to make the volume 250 mL d) dissolve 5.30 g of Na,CO, in 250 mL. of water e) dissolve 5.30 g of Na CO, in water and then add water lo make the volume 250 ml 18. 100. mL of a 5.00 % v/ v alcohol in water solution is mixed with 50.0 mL of a 10.0 % v / v alcohol in water solution. What is the v/v% of the solution after mixing? (Assume the final volume is T50 mL.) c) 15.0% d) 12.5% e) 8.33 % b) 6.67 % a) 7.50 % 19. What is true about a 2.00 M NaOH solution? (Its density is 1.20 g/mL; NaOH has 40.0 g / mol) a) 1L of it has a mass of 1200. g c) The solution has a m/v% of 8.00 % d) all of the above b) The solution has a m/m % of 6.67 % e) a & b 20. 100 mL of an aqueous solution contains 8.0 g of sugar. If another 8.0 g of sugar are added which statement is now true? (Assume no volume change.) a) the moles of sugar in the solution are now twice as large b) the molarity of the solution is now twice as large c) the m/v % of the solution is now twice as large d) a & c e) a, b, & c
can you do number 10,11,12,13,14,15,16,17,18,19 and 20?

show calculations please

Answer 1

Ans 10 : d) 1

Each mole C6H12O6 has 12 atoms of hydrogen .

Each mole of H2 has two atoms of hydrogen

so 6 moles of H2 = 6 x 2 atoms = 12 atoms

so 1 mole of C6H12O6 will be produced.

Ans 11 : e) a , b and c

Potassium loses one electron , magnesium loses two and aluminium loses three to attain noble gas configurations. So option e is correct.

Ans 12 : a) CaS

The combining capacity of Ca is +2 and that of S is -2 , so CaS is the correct molecular formula

Ans 13 : c) 3

The balanced chemical equation is given as :

N2H4 + 3O2 = 2NO2 + 2H2O

so the correct option is c.