MyQuestionIcon

2

You visited us 2 times! Enjoying our articles? Unlock Full Access!

Bohr's Model of a Hydrogen Atom

how many mole...

Question

how many moles are there in 49.0g of potassium dichromate, K2Cr2O7 ? (atomic masses: K = 39, Cr = 52, O = 16 )

Open in App

Solution

Mass of potassium dichromate (K₂Cr₂O₇ ) = 49 g
Molar mass of K₂Cr₂O₇ = 2 $\times$ 39 + 2 $\times$ 52 + 7 $\times$ 16 = 294 g mol^-1
Number of moles (n) = $\frac{Mass}{Molar mass}$
n = $\frac{49}{294}$ = 0.166 moles

Suggest Corrections

thumbs-up

1

Similar questions

Q. A compound of potassium is assigned the formula

K_{2} C r_{2} O_{7}

How many elements are there in this compound?

Q. What is the increasing order of equivalent weights of the following oxidising agents?
(i)

K M n O_{4} ⟶ M n^{2 +}

K_{2} C r_{2} O_{7} ⟶ C r^{3 +}

K C l O_{3} ⟶ C l^{-}

K = 39, C r = 52, M n = 55, C l = 35.5, O = 16

]

Q. Approximately how many moles of potassium permanganate,

K M n O_{4}

, are present in

40 g

of this compound? (Atomic weights:

K = 39; M n = 55; O = 16

)

Q. How many moles of

C r

85 g

C r_{2} S_{3}

C r = 52, S = 32

)

Q. How many grams of sulphuric acid will be present in 0.25 mol of sulphuric acid?
( atomic mass of S = 32 u and O = 16 u respectively)

View More

Join BYJU'S Learning Program

similar_icon

Related Videos

lock

Bohr's Model of a Hydrogen Atom

CHEMISTRY

Watch in App

explore_more_icon

Explore more

Bohr's Model of a Hydrogen Atom

Standard XII Chemistry

Join BYJU'S Learning Program

CrossIcon