The answer to this questions is letterB
The Molecular Equation is as follow,
Ba(NO₃)₂ ₍aq₎ + MgSO₄ ₍aq₎ → BaSO₄ ₍s₎ + Mg(NO₃)₂ ₍aq₎
The Total Ionic Equation is as follow,
Ba²⁺₍aq₎ + 2NO₃⁻ ₍aq₎ +Mg²⁺ ₍aq₎ + SO₄²⁻ ₍aq₎ → Mg²⁺ ₍aq₎ + 2NO₃⁻ ₍aq₎ + BaSO₄ ₍aq₎
Here, Mg²⁺ and NO₃⁻ are spectator Ions,
So,
The Net Ionic Equation is as follow,
Ba²⁺ ₍aq₎ + SO₄²⁻ ₍aq₎ → BaSO₄ ₍aq₎
Answer:

Explanation:
Hello,
In this case, for us to compute the absorbed heat, we apply the following equation:

Whereas we use the mass, specific heat and temperature change for the piece of aluminium, thus, we obtain:

It is positive as the heat is entering, therefore the temperature raises.
Best regards.
These percentages are most likely mass percentages. Therefore, determine the mass of each element in 100g of the compound.
<span>75g C, 25g H. </span>
<span>Divide these masses by their molar mass to find the ratios of the moles of element in the compound. Divide these values by the smallest of the two/three to get the ratios. </span>
<span>6.25:25 C:H --> 1:4 </span>
<span>So the formulae are CH4 (methane).</span>