Question

calculate the molecular weight of k2cr2o and h2so4​

Answer 1

Explanation:

Molecular mass of K

2

Cr

2

O

7

=2×(Atomic mass of K) +2×(Atomic mass of Cr) +7×(Atomic mass of O)

=2×(39)+2×(52)+7×(16)

=78+104+112

=294 amu

Molecular mass of Cr

2

(SO

4

)

3

=2× (Atomic mass of Cr) +3× (Atomic mass of S) +4×3× (Atomic mass of O)

=2×(52)+3×[(32)+4×(16)]

=2(52)+3×[32+64]

=104+3×[96]

=104+288

=392 amu