calculate the molecular weight of k2cr2o and h2so4
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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
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