How many grams of H3PO4 are in 175 Ml of a 3.5 M solution of H3PO4?

Answer 1

I assume you mean 175 ml (milliliters).
There will be 3.5 moles x 0.175 liters or 0.6125 moles of H3PO4.

Uning the molar mass of that compound, Which you are surely able to compute, convert that number of moles to grams.

When I went to school long ago, molar mass was called molecular weight. It is still computed the same way.

Answer 2

(3.5mol/1 L)x(.175L)=.6125moles of H3PO4

.6125x(98g/1 mol)=60.025g