The visible universe is estimated to contain $10^{22}$ stars. How many moles of stars are present in the visible universe?
- A$0.0666$
- B$0.0166$
- C$0.2754$
- D$0.0256$
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The chemical symbol for sodium is
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View SolutionWrite the chemical formulae for the following compounds and find the ratio by mass of the combining elements in each one of them.
$(N=14 \ u, H=1 \ u, C=12 \ u, O=16 \ u, S=32 \ u)$
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$(N=14 \ u, H=1 \ u, C=12 \ u, O=16 \ u, S=32 \ u)$
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View SolutionWrite the chemical formulae for the following substances and calculate the molecular mass for each one of them:
$(a)$ Caustic potash
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$(a)$ Caustic potash
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$(c)$ Limestone
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