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I'm having trouble solving this percentage concentration problem:

A student wants to make 5.00% solution of rubidium chloride using 0.377g of the substance. What mass of water will be needed to make the solution?

[g RbCl2/(g RbCl2 + g H2O)]x100 = 5.00

Solve for g H2O.

A day later I just notied a HUGH goof. Rubidium chloride is RbCl, NOT RbCl2. But that doesn't change the problem.

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