Question

1. Calculati masa moleculara : amoniac , hidroxid de calciu , sulfat de potasiu.
2. Calculati numarul de moli de substanta din 20g amoniac si 10g H2O.
3. Calculati cate g de Calciu se afla in 40 g Hidroxid de Calciu.

PLS REPEDE :(

Answer 1

1. MNH3=AN+3AH=14+3*1=17g/mol

MCa(OH)2=ACa+2(AO+AH)=40+2(16+1)=74g/mol

MK2SO4=2AK+AS+4AO=2*39+32+4*16=174g/mol


2. n=m/M=20/17=1.176 moli NH3

n=m/M=10/18=0.(5) moli H2O

3. 74g Ca(OH)2................40g Ca
40g Ca(OH)2..................x=21.(621)g Ca