Can someone answer this problem thanks!

19.1 Avogadro's Number The ideal gas law states pV = nRT, where R = 8.2 x 10-5m . atm mol . K and NA = 6.02 x 1025 mol-1. Approximately how many air molecules are there in a 1 kg sample of air at STP? (Assume 1 g of air per cubic meter, temperature = 300 K and 1 atmosphere of pressure.) 41000 O 2.4 x 1028 O 2.4 x 1026 0 6.8 x 1026 O 24