What is the molar mass of ?

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Problem

What is the molar mass of Na2B4O7⋅10H2O\text{Na}_2\text{B}_4\text{O}_7\cdot10\text{H}_2\text{O}? (1) 278 g mol−1278\,\text{g}\,\text{mol}^{-1} (2) 381 g mol−1381\,\text{g}\,\text{mol}^{-1} (3) 146 g mol−1146\,\text{g}\,\text{mol}^{-1} (4) 238 g mol−1238\,\text{g}\,\text{mol}^{-1}

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