Answer:
Mg(s) +<em> 2</em> HCl (aq) → H₂(g) + MgCl₂
0.415g of H₂(g) <em>-Assuming mass of Mg(s) = 10.0g-</em>
Explanation:
Balancing the reaction:
Mg(s) + HCl (aq) → H₂(g) + MgCl₂
There are in products two atoms of H and Cl, the balancing equation is:
Mg(s) +<em> 2</em> HCl (aq) → H₂(g) + MgCl₂
<em>Assuming you add 10g of Mg(s) -Limiting reactant-</em>
<em />
10g of Mg are (Atomic mass: 24.305g/mol):
10g × (1 mol / 24.305g) = <em>0.411 moles of Mg</em>
<em>-Theoretical yield is the amount of product you would have after a chemical reaction occurs completely-</em>
Assuming theoretical yield, as 1 mole of Mg(s) produce 1 mole of H₂(g), theoretical yield of H₂(g) is 0.411moles H₂(g). In grams:
0.411mol H₂(g) × (1.01g / mol) = <em>0.415g of H₂(g)</em>
Answer:
Cellular division has three main functions: (1) the reproduction of an entire unicellular organism, (2) the growth and repair of tissues in multicellular animals, and (3) the formation of gametes (eggs and sperm) for sexual reproduction in multicellular animals.
Answer:
About 0.566 L.
Explanation:
Let the substance be represented by <em>X</em>.
We want to determine how much volume in L will 8,326 dg (decigrams) of the substance which has a density of 1.47 g/mL occupy.
To convert from 8,326 dg to L, we can first convert from dg to g, g to mL using the density, and mL to L.
Recall that 1 g = 10 dg and 1 L = 1000 mL. We are also given that the density of <em>X</em> is 1.47 g/mL. This yields three ratios:
Starting with the initial value, multiply:
Hence, 8,326 dg of the substance occupies about 0.566 L.
Answer:
30.8 grams O
Explanation:
In H₂O, there are 2 moles of hydrogen for every 1 moles of oxygen. You can use this to convert between moles of H and moles of O. Then, you can use the molecular weight of oxygen (15.998 g/mol) to convert between moles O and grams. The answer should have 3 sig figs because the given value (3.85) also has 3 sig figs.
3.85 moles H 1 mole O 15.998 g
-------------------- x ------------------ x -------------------- = 30.8 grams O
2 moles H 1 mole O