1Question
A plant absorbs 2.5 g of nitrogen from the soil. How many moles of nitrogen atoms is this?
2Question
A fertilizer sample contains 15 g of potassium nitrate, KNO3. What is its molar mass?
3Question
A plant cell produces glucose during photosynthesis. What mass of glucose corresponds to 0.25 mol of glucose, C6H12O6?
4Question
A student waters a plant with 500 mL of solution that contains 0.20 mol/L magnesium sulfate. How many moles of magnesium sulfate are present?
5Question
A leaf contains 12% water by mass. If a leaf sample has a mass of 25 g, how much water does it contain?
6Question
A soil sample contains 3.0 x 10^-3 mol of calcium ions. How many calcium ions is this?
7Question
A plant uses 44 g of carbon dioxide in photosynthesis. How many moles of CO2 is this?
8Question
A chlorophyll molecule has the formula C55H72MgN4O5. How many grams of oxygen are in 1.0 mol of chlorophyll?
9Question
A plant nutrient solution has a concentration of 0.80 mol/L of nitrate ions. How many liters of solution contain 2.4 mol of nitrate ions?
10Question
A seedling absorbs 0.060 mol of phosphate ions, PO4^3-. What mass of phosphate ions is this?
11Question
A plant hormone solution is made by dissolving 5.0 g of a compound with molar mass 250 g/mol in enough water to make 200 mL of solution. What is the molarity?
12Question
A farmer adds 8.0 g of ammonium sulfate, (NH4)2SO4, to soil. How many moles of ammonium sulfate is this?
13Question
A plant leaf takes in 0.15 mol of water during a laboratory experiment. How many grams of water is this?
14Question
A solution for hydroponics contains 0.45 mol of calcium nitrate in 1.5 L of solution. What is the concentration in mol/L?
15Question
A plant stores 18 g of starch, approximated as C6H10O5. How many moles of starch monomer units does this represent?
16Question
A researcher measures 0.040 mol of iron in a fertilizer supplement. What mass of iron is present?
17Question
A plant root releases 0.25 mol of H+ ions into the soil over a day. How many H+ ions is this?
18Question
A hydroponic tank contains 6.0 L of solution with nitrate concentration 0.12 mol/L. If half the solution is replaced with pure water, what is the new nitrate concentration?
19Question
A plant pigment sample contains 0.020 mol of carotenoid with molar mass 536 g/mol. What is the mass of the sample?
20Question
A leaf chamber contains 0.80 mol of oxygen gas at standard conditions. What volume does this occupy at 22.4 L/mol?
21Question
A plant fertilizer contains 24% nitrogen by mass. How many grams of nitrogen are in 150 g of fertilizer?
22Question
A plant cell wall sample contains 4.5 g of cellulose. If the repeating unit has a molar mass of 162 g/mol, how many moles of repeating units are present?
23Question
A greenhouse injects 3.2 mol of CO2 into a chamber. How many grams of CO2 is this?
24Question
A solution is prepared by dissolving 12 g of glucose in enough water to make 300 mL of solution. What is the molarity of glucose?
25Question
A plant absorbs 0.75 g of phosphorus. Assuming all of it is in elemental phosphorus, how many moles is this?
26Question
A fertilizer bag states it contains 5.0 kg of urea, CO(NH2)2. How many moles of urea are in the bag?
27Question
A plant scientist prepares 2.0 L of a 0.15 mol/L potassium ion solution. How many grams of potassium ions are present?
28Question
A leaf tissue sample has 0.030 mol of chlorophyll molecules. How many molecules is this?
29Question
A gardener dilutes 250 mL of a 1.2 mol/L fertilizer solution to 1.0 L total volume. What is the final concentration?
30Question
A plant’s photosynthesis produces 9.0 g of glucose. How many moles of glucose is this, and how many moles of carbon atoms does it contain?
31Question
A hydroponic system needs 0.80 mol of magnesium ions. If magnesium sulfate heptahydrate, MgSO4·7H2O, is used as the source, how many grams of MgSO4·7H2O are required?
32Question
A plant sample contains 2.4 g of nitrogen and 0.80 g of hydrogen. What is the mole ratio of N to H?
33Question
A scientist finds that a plant extract contains 0.050 mol of an alkaloid with molar mass 303 g/mol. If the extract volume is 250 mL, what is the concentration in g/L?
34Question
A fertilizer mixture contains 40.0% ammonium nitrate by mass. If a bag contains 12.5 kg of the mixture, how many grams of ammonium nitrate are present?
35Question
A plant uses 1.5 mol of water in a reaction. How many molecules of water is this, and what mass of water is it?
36Question
A greenhouse maintains CO2 at 800 ppm by volume in a 5000 L chamber. Estimate the volume of CO2 present in the chamber.
37Question
A plant nutrient film technique system delivers 0.0040 mol of nitrate per minute. How many moles are delivered in 6.0 hours?
38Question
A leaf sample shows 0.125 mol of oxygen atoms in organic molecules. If all oxygen atoms came from glucose units, how many moles of glucose units would this represent?
39Question
A plant pigment analysis reports 2.7 x 10^-3 mol of chlorophyll in a 0.50 g sample. What is the molar mass of the chlorophyll in this sample?
40Question
A farmer wants to supply 0.50 mol of potassium and 0.20 mol of nitrogen using potassium nitrate, KNO3, only. How many grams of KNO3 are needed, and how much potassium and nitrogen will it provide?