For classification, the protists are divided into three groups: Animal-like protists, which are heterotrophs and have the ability to move. Plant-like protists, which are autotrophs that photosynthesize. Fungi-like protists, which are heterotrophs, and they have cells with cell walls and reproduce by forming spores.
Answer:
The new volume of the gas is 70 mL (option A)
Explanation:
Step 1: Data given
Volume of the gas = 93 mL = 0.093 L
Temperature = 91 °C = 364 K
The temperature is reduced to 0°C = 273 K
The pressure doesn't change
Step 2: Calculate the new volume of the gas
V1/T1 = V2/T2
⇒with V1 = the initial volume of the gas = 0.093 L
⇒with T1 = the initial temperature of the gas = 364 K
⇒with V2 = the new volume = TO BE DETERMINED
⇒with T2 = the reduced temperature = 273 K
0.093L/364K = V2/273 K
V2 = 0.06975 L = 69.75 mL ≈ 70 mL
The new volume of the gas is 70 mL (option A)
Answer:
2.71*10^24 formula units in 4.5 moles NaCl
Explanation:
Remark
Make sure you know what a formula unit it. In this case, what it consists of is 1 ion of Na+ Combined with 1 ion of Cl- Together they combine to make NaCl which is ordinary table salt.
1 mole contains 6.02 * 10 ^23 formula units of any chemical -- in this case NaCl.
Therefore 4.50 moles have 4.5 * 6.02*10^23 formula units.
Answer:2.71*10^24
<span>The key in
the balancing of chemical reaction is to make sure that you got the exact
chemical formula of the substance that is reacting and the yielded product.
After getting the formula, identify first the hardest element/atom to be
balanced such as Na, Zn, Cl, C, O, etc. Then proceed to the easier ones such as
O, H. Make sure to note the atoms present in the molecule of the substance. Among
the three equations, PCl2 + 4H2O --->H3PO4 + 5HCL is not balanced. The
hardest element here is the Cl. Observe that there are 5Cls in the product side
so you must add 5 to the PCl2. However, there are only 2Cl atoms and it needs
3 to balance the equation. Also, there is no P in the product side. This equation
is invalid.</span>