Most likely (C) because he can't determine mass of a liquid.
Answer:
32.7 L of H₂
Explanation:
We'll begin by calculating the number of mole in 95 g of Zn. This can be obtained as follow:
Mass of Zn = 95 g
Molar mass of Zn = 65 g/mol
Mole of Zn =?
Mole = mass /Molar mass
Mole of Zn = 95/65
Mole of Zn = 1.46 mole
Next, we shall determine the number of mole of H₂ produced by the reaction of 95 g (i.e 1.46 mole) of Zn. This can be obtained as illustrated below:
Zn + H₂SO₄ —> ZnSO₄ + H₂
From the balanced equation above,
1 mole of Zn reacted to produce 1 mole of H₂.
Therefore, 1.46 mole of Zn will also react to produce 1.46 mole of H₂.
Finally, we shall determine the volume of H₂ obtained at STP. This can be obtained as follow:
1 mole of H₂ = 22.4 L at STP.
Therefore,
1.46 mole of H₂ = 1.46 × 22.4
1.46 mole of H₂ = 32.7 L at STP
Thus, 32.7 L of H₂ were obtained from the reaction.
Answer:
cellular respiration is needed for our cells to get energy from our food.
Explanation:
Through the process of cellular respiration, the energy in food is converted into energy that can be used by the body's cells. During cellular respiration, glucose and oxygen are converted into carbon dioxide and water, and the energy is transferred to ATP.
Answer:
The number of molecules = 2.6408 molecules
Explanation:
To determine the number of molecules in water, we need to determine how many moles of water we have
Water has a molar mass of 18.015g/mol, this means that one mole of water molecules has a mass of 18.015g
To find the number of molecules,
7.9g * 1 mole H2O/ 18.015g
= 0.4385mole of H2O
Using avogadro number,
0.4385 H2O * 6.022* 10^23molecules/ 1 mole of H2O
That's 0.4385 H2O multipled by 6.022*10^ 23 molecules divided by 1 mole of H2O
Which gives == 2.6408 molecules