Химия 1-100

Specify value of valence of the atom an carbon:

• 4;2

• 4; 3

• 2;1

• 6; 4

• 6;2

Specify a unit of measure of the substances molar weight:

• g/mole

• kg/mole

• g

• kg

• l/mole

Calculate the relative molar weight of a sulfuric acid

• 98

• 98

• 980

• 0,98

• 0,098

Calculate the relative molar weight of the chloride of sodium

• 58,5

• 60,1

• 72,2

• 53,2

• 42

Specify the formula of the iron(III) sulfate

• Fe₂₍SO₄₎₃

• FeSO₄

• FeS₂

• FeSO₃

• Fe(SO₃₎₃

Finish the equation of reaction and specify the substance – х

Al(OH)₃ + H₂S → x + H₂O

• Al₂S₃

• AlSО₄

• AlSО₃

• Al₂SО₄

• Al₂₍SО₄₎₃

Specify multiacid a hydroxides:

• Al(OH)₃, Fe(OH)₂

• Ca(OH)₂; KOH

• NaOH; HOH

• KOH; Fe(OH)

• Fe(OH)₂; NH₄OH

Calculate the molar weight for the Ca₃(PO₄)₂

• 310

• 101,6

• 22,5

• 16,6

• 15,5

Specify of non-gaseous substance

• Mo

• H₂

• N₂

• PH₃

• O₃

Calculate a molar weight mass hydrosulfuric acid

• 34

• 66

• 82

• 40

• 17