PLEASE HELP Question 3
How many grams of lead (II) nitrate will be needed to react with sodium chromate to produce 4.62 g of sodium nitrate?
Na CrO4 + Pb(NO3)2 → PbCrO4 + 2 NaNO3
Useful info:
Molar mass NaNO3 = 84.99 g/mol
Molar mass Pb(NO3)2 = 331.20 g/mol
OPTIONS:
8.2
11.2
6.7
9.0

Consider a culture medium on which only gram-positive organisms such as staphylococcus aureus colonies can grow due to an elevated nacl level. a yellow halo surrounds the growth, indicating the bacterium fermented a sugar in the medium, decreasing the ph as a result and changing the color of a ph indicator chemical. this type of medium would be referred to as a differential and enrichment culture.