Answer: C. 146 g
Explanation:
To calculate the moles, we use the equation:
Thus
For sodium nitrate
moles = 1.72
Molar mass of sodium nitrate = 85g/mol
Putting values in above equation, we get:
The length unit of decimeter is 100 times larger than a millimeter. The relationship between length units is 1 meter = 10 decimeter = 100 centimeter = 1000 millimeter.
Answer:
2.05 x 10²⁴ molecules
Explanation:
The balanced equation for the chemical reaction is the following:
2 HCl + Mg → MgCl₂ + H₂
According to the equation, 2 moles of HCl are required to react with 1 mol of magnesium (Mg), so the moles of HCl required to react with 1.7 mol Mg are calculated as follows:
moles HCl = 1.7 mol Mg x 2 mol HCl/mol Mg = 3.4 mol HCl
We know that 1 mol of any compound is equal to 6.022 x 10²³ molecular entities, so we convert the moles of HCl to molecules as follows:
molecules HCl = 3.4 mol HCl x 6.022 x 10²³ molecules/1 mol = 2.05 x 10²⁴ molecules
Answer: Dip the pH paper into each test tube and lay it on the table to let it change color. Use a transfer pipet to remove a few drops from the solution to drop onto the paper. Wait a minute or so before reading color. Use the same piece of indicator paper for each solution to conserve paper.
This should be under biology.
To transport the substance inside the cell when the concentration inside the cell is already higher than outside the cell would require active transport because the substance would be moving against its concentration gradient.