Chemistry Answers

Convert 37 (µmol/L) of sulphate to mg/l.

Unit conversion for Soluble Reactive Silica (SRSi)

1. 25.5 μmol L^-1 to (mg l-1)
2. 0.82 (mg l-1) to μmol L^-1

Unit conversion for Soluble Reactive Phosphorus (SRP PO4-P)

Convert the following:

1. 9706.7 (mg/m²) to (μg 1^-1)
2. 6.4 (μg 1^-1) to (mg/m²)
3. 0.04 mg/l to (μg 1^-1)

A sample of oxygen gas (O

2

) has a volume of

9

.0 L and a pressure of

2

.0 atm. What is the new

pressure if the volume is decreased to

3

.0 L?

How many moles of Fe are in 210 L of Fe

The following set of lead determinations on separate aliquots of a pooled blood serum were reported: 103,106,107 and 114 meq/ L. One of the values appears suspect. Should the suspected be retained or discarded at 95% confidence level?

One of the reactions used to inflate automobile air bags involves sodium azide

(NaN3). The balanced equation will be: 2NaN3(s) → 2Na(s) + 3N2(g). Determine the mass of N2

produced from the decomposition of 100.0 g of NaN3.

2.50.00 mL of concentrated nitric acid (16M

HN03) is diluted to 1.000 L. What is the

concentration of the new solution?

Learning Task 2

Write the equilibrium constant expression for each of the following reactions.

1. H2(g) + I2(g) ⇌ 2HI(g)

2. 3O2(g) ⇌ 2O3(g)

3. 2CO2(g) ⇌ 2CO(g) + O2(g)

4. CH3COOH(aq) + C2H5OH ⇌ CH3COOC2H5(aq) + H2O(l)

5. AgCl(s)

⇌

Ag+

(aq) + Cl-

(aq)

Express the concentration of solution in % w/v containing 12 g sodium chloride and 50 ml of water.