Let's use indeal gas law for the first cylinder
where "{{m_{{\\text{Ne}}}}}" - mass of Ne, "{{M_{{\\text{Ne}}}}}" - molar mass of Ne. We know, that pressure and temperature are the same in the second cylinder and "{V_2} = 2V" , so ideal gas law for the second cylinder will be
Thus we can multiply the first equation by 2 and equalize the right sides
and express mass of the hydrogen
Now let's do the calculations (atomic weights can be found in the periodic table so "{M_{{\\text{Ne}}}} \\approx 20.18[\\frac{{\\text{g}}}{{{\\text{mol}}}}]" and "{M_{{{\\text{H}}_2}}} = 2 \\cdot {M_{\\text{H}}} \\approx 2 \\cdot 1.008[\\frac{{\\text{g}}}{{{\\text{mol}}}}] = 2.016[\\frac{{\\text{g}}}{{{\\text{mol}}}}]" )
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